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05-31-2013, 08:25 AM
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CC Member
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Join Date: Apr 2013
Location: Niwot,
CO
Cobra Make, Engine: Superformance, 418 sbf
Posts: 14
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Not Ranked
Side pipes and headers SPF 351
Anyone have suggestions on replacing the headers and side pipes from stock Superformance units? The car feels like it has a head cold. I am running a small block 351/418. Fire Fly is the only option I have seen thus far.
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05-31-2013, 09:05 AM
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CC Member
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Join Date: Oct 2008
Location: Lions Bay,
BC
Cobra Make, Engine: CAN-AM cobra, 460 SVO
Posts: 326
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Not Ranked
check out stainless headers, Stainless Headers Mfg., Inc. fabricates custom headers in stainless and mild steel tons of options, not sure if they have a bolt in replacement but they certainly have custom capability. they are just in process of building me a set.
__________________
Mark
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05-31-2013, 09:15 AM
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CC Member
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Join Date: Aug 2007
Location: Carlsbad,
Ca
Cobra Make, Engine: SPF 2932 with 438 Lykins Motorsports engine. Previous owner of FFR 5452.
Posts: 2,613
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Not Ranked
Full throttle in Reno will build you a set of sidepipes that will wake up your engine. They can either redo yours or will sell you a set exchange. Put a small mirror into the end of your sidepipes and take a look at how small the muffler really is. My inside diameter was around 1 3/4 inch and my 427 sounded like a sewing machine. Had full throttle make me a set with 3" diameter muffler and now the engine sounds and feels like a top fuel dragster.
Make sure you have the correct headers for your engine. SPF has two different sets for 302/351 blocks. The larger port size is the one that should have been installed from the dealer.
Easy fix and one you will never regret.
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Jim
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05-31-2013, 10:09 AM
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Senior Club Cobra Member
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Join Date: Sep 2000
Location: Holderness, NH, US of A,
NH
Cobra Make, Engine: CSX 4772 old iron FE
Posts: 5,499
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Not Ranked
We had traction problems after upgrading an SPF exhaust it made that much difference. I have used Stainless Specialties mufflers and usually keep a set of Classic Chambered on the shelf. I'm putting them on a stroked SPF Windsor now coincidentally.
Even comes with destructions!
Classic Chambered Exhaust Inc. - Cobra
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06-01-2013, 03:39 AM
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CC Member
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Join Date: Jul 2010
Location: McMurray,
PA
Cobra Make, Engine: Superformance #522
Posts: 528
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Not Ranked
Installed larger mufflers into existing side pipes then recoated. You will pick up some HP with that size motor, 10-20?, and will really sound much better. If you go 3 inch muffler you will need earplugs all the time.
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06-01-2013, 05:42 AM
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CC Member
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Join Date: Mar 2002
Posts: 272
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Not Ranked
I would seriously consider FireFly. I could not be happier with the look, sound, and build quality of the side pipes from Ron Roberts.
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06-01-2013, 11:22 AM
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Senior Club Cobra Member
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Join Date: Jan 2007
Location: Sacramento,
CA
Cobra Make, Engine: Superformance 460 SVO
Posts: 305
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Not Ranked
+1 for Firefly and Ron Roberts
__________________
- Mel
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06-01-2013, 12:06 PM
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CC Member
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Join Date: Aug 2007
Location: Carlsbad,
Ca
Cobra Make, Engine: SPF 2932 with 438 Lykins Motorsports engine. Previous owner of FFR 5452.
Posts: 2,613
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Not Ranked
I agree that if you want a new set of stainless steel pipes, Firefly is the way to go.
However, if you're satisfied with the look and condition of your stock pipes, Full Throttle will open up your existing muffler, to whatever diameter you decide on, and then have them ceramic coated and shipped back to you for about half the cost of a new set from Firefly.
__________________
Jim
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06-02-2013, 04:15 AM
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CC Member
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Join Date: Jan 2009
Location: Harrison Twp,
MI
Cobra Make, Engine: SPF Coupe #136, 427SR FI
Posts: 299
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Not Ranked
Quote:
Originally Posted by jhv48
I agree that if you want a new set of stainless steel pipes, Firefly is the way to go.
However, if you're satisfied with the look and condition of your stock pipes, Full Throttle will open up your existing muffler, to whatever diameter you decide on, and then have them ceramic coated and shipped back to you for about half the cost of a new set from Firefly.
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+3 for Ron and Firefly pipes - the way to go!
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06-02-2013, 01:07 PM
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CC Member
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Join Date: Apr 2013
Location: Niwot,
CO
Cobra Make, Engine: Superformance, 418 sbf
Posts: 14
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Not Ranked
What is your opinion on size pipes from Ron? He has 2.5" vs 3". Ron said 3" is super loud/race and 2.5" is aggressive and nice sounding. Also, has anyone bought his headers? What is your opinion about the stock SPF headers...worthwhile swapping them?
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06-03-2013, 03:15 AM
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CC Member
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Join Date: Jan 2009
Location: Harrison Twp,
MI
Cobra Make, Engine: SPF Coupe #136, 427SR FI
Posts: 299
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Not Ranked
Quote:
Originally Posted by Kahuna1
What is your opinion on size pipes from Ron? He has 2.5" vs 3". Ron said 3" is super loud/race and 2.5" is aggressive and nice sounding. Also, has anyone bought his headers? What is your opinion about the stock SPF headers...worthwhile swapping them?
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I know Ron's work personally - great stuff!.
I know many people with his pipes and also have done headers and they are very happy. If you have the cash I would do the headers also.
On size, it is a personal choice based on the sound and sound level you are after. Keep in mind they are at your ear so it will also effect your driving comfort. The 2.5 will sound mean enough (for my taste).
Jeff
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06-03-2013, 09:02 AM
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CC Member
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Join Date: Jul 2012
Location: Eastern Long Island,
NY
Cobra Make, Engine: Superformance SPF2271
Posts: 172
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Not Ranked
Any sound clips?
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06-03-2013, 10:45 AM
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Senior Club Cobra Member
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Join Date: Jan 2007
Location: Sacramento,
CA
Cobra Make, Engine: Superformance 460 SVO
Posts: 305
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Not Ranked
__________________
- Mel
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06-03-2013, 12:00 PM
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CC Member
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Join Date: Aug 2007
Location: Carlsbad,
Ca
Cobra Make, Engine: SPF 2932 with 438 Lykins Motorsports engine. Previous owner of FFR 5452.
Posts: 2,613
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Not Ranked
I believe that 3" mufflers are recommended if you have over 500 hp.
__________________
Jim
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06-03-2013, 05:48 PM
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CC Member
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Join Date: Dec 2001
Location: Oklahoma City,
OK
Cobra Make, Engine: SPF 2303, Titanium Silver, Roush 427 SR/TW, AED Carb, Firefly Sides, TKO 600
Posts: 102
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Not Ranked
+4 for Ron and Firefly. Purchased early this spring and extremely happy with his pipes. He recommended 2.5 inch mufflers for my 512 hp/522 tq engine.
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06-03-2013, 09:48 PM
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CC Member
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Join Date: Dec 2004
Location: Hillsboro,
OR
Cobra Make, Engine: Superformance SPO2512 427W TKO 600/ NW Exotics 351 Cleveland/Tremec 3550-Sold
Posts: 71
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Not Ranked
I'm using a set of polished stainless side pipes from GAS-N. Unfortunately it looks like he may no longer be in the side pipe business, which is unfortunate because the pipes are gorgeous, work, and at around $1500, were a good deal.
I've had three sets of side pipes on my SPF so far: the stock SPF pipes, a set of GAS-N pipes with a 2" core and finally, a set of GAS-N pipes with a 2.5" core. The factory pipes and the 2" core GAS-N pipes were fairly quiet and the GAS-N 2" core pipes had a nice "crackle" to the sound. The 2.5" GAS-N pipes have more of a deep "rumble" to the sound.
I also tested the SPF headers/side pipes and the SPF headers/2" core GAS-N side pipes on the dyno with my 427 SBF. Compared to the stepped 1 5/8" to 1 3/4" dyno headers with no mufflers, what I found, at the 500 HP level, was the factory SPF exhaust system cost something like 20 HP at the peak (5900 RPM). The 2" core GAS-N pipes were right up there with the larger flowpath SPF mufflers. These are the results I saw with my tests. I did not test the 2 1/2" GAS-N pipes on the dyno.
Maybe I got the freak set of factory pipes that don't cost a bunch of power. I doubt it, but if so, I should sell them at a premium price!
Does my car run any better with the larger core mufflers? I can't tell-I seem to have a traction problem with whatever muffler is on the car. I do think the 2 1/2" core pipes are easier on the ears compared to the 2" pipes. I do know that loud does not always equal more power.
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06-03-2013, 10:45 PM
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CC Member
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Join Date: Apr 2013
Location: Niwot,
CO
Cobra Make, Engine: Superformance, 418 sbf
Posts: 14
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Not Ranked
Went with the 2.5". Should be here next week. Staying with the stock SPF headers for now. Thanks for the input!
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06-04-2013, 02:35 AM
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CC Member
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Join Date: Jul 2010
Location: McMurray,
PA
Cobra Make, Engine: Superformance #522
Posts: 528
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Not Ranked
Quote:
Originally Posted by Dana E.
I'm using a set of polished stainless side pipes from GAS-N. Unfortunately it looks like he may no longer be in the side pipe business, which is unfortunate because the pipes are gorgeous, work, and at around $1500, were a good deal.
I've had three sets of side pipes on my SPF so far: the stock SPF pipes, a set of GAS-N pipes with a 2" core and finally, a set of GAS-N pipes with a 2.5" core. The factory pipes and the 2" core GAS-N pipes were fairly quiet and the GAS-N 2" core pipes had a nice "crackle" to the sound. The 2.5" GAS-N pipes have more of a deep "rumble" to the sound.
I also tested the SPF headers/side pipes and the SPF headers/2" core GAS-N side pipes on the dyno with my 427 SBF. Compared to the stepped 1 5/8" to 1 3/4" dyno headers with no mufflers, what I found, at the 500 HP level, was the factory SPF exhaust system cost something like 20 HP at the peak (5900 RPM). The 2" core GAS-N pipes were right up there with the larger flowpath SPF mufflers. These are the results I saw with my tests. I did not test the 2 1/2" GAS-N pipes on the dyno.
Maybe I got the freak set of factory pipes that don't cost a bunch of power. I doubt it, but if so, I should sell them at a premium price!
Does my car run any better with the larger core mufflers? I can't tell-I seem to have a traction problem with whatever muffler is on the car. I do think the 2 1/2" core pipes are easier on the ears compared to the 2" pipes. I do know that loud does not always equal more power.
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20 HP gain matches up with what others have posted on a 427 SB. On my 351, larger muffler HP gain was almost nils on the dyno. Actually lost some down low.
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06-17-2013, 09:06 PM
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CC Member
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Join Date: Sep 2006
Location: Highland,
MI
Cobra Make, Engine:
Posts: 221
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Not Ranked
Stephen @ Full Throttle uses COBRAPACK mufflers. I know.
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06-24-2013, 05:11 AM
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CC Member
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Join Date: Apr 2013
Location: Niwot,
CO
Cobra Make, Engine: Superformance, 418 sbf
Posts: 14
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Not Ranked
I installed the 2.5" pipes from Ron at Firefly. The craftsmanship is excellent. The sound is well balanced for street use. Idle is healthy and reminds you what you are about to unleash. On the throttle is loud but exactly what you want and expect. Cruise is down right quiet. Ear plugs are optional! The best part...they make power over the stock Superformance pipes by a big margin. The "head cold" that the car had is now gone. Thanks all for the recommendation.
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