Club Cobra Gas - N Exhaust  

Go Back   Club Cobra > Manufacturers, Engine Builders, tools, and parts. > BackDraft Racing ---

Keith Craft Racing
Nevada Classics
Keith Craft Racing
Main Menu
Module Jump:
Nevada Classics
Nevada Classics
Keith Craft Racing
MMG Superformance
Advertise at CC
Banner Ad Rates
MMG Superformance
MMG Superformance
March 2024
S M T W T F S
          1 2
3 4 5 6 7 8 9
10 11 12 13 14 15 16
17 18 19 20 21 22 23
24 25 26 27 28 29 30
31            

Kirkham Motorsports

Like Tree3Likes
  • 1 Post By spdbrake
  • 1 Post By spdbrake
  • 1 Post By bobcowan

Reply
 
LinkBack Thread Tools Rate Thread Display Modes
  #1 (permalink)  
Old 01-18-2020, 02:09 PM
Bucknut56's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Feb 2018
Location: Liberty Township, OH
Cobra Make, Engine: Backdraft #368
Posts: 17
Not Ranked     
Default Wanting Louder Backdraft Exhaust

Hey all,
I am wanting to make my exhaust louder and wanted to see what/if anyone has used for the process. I do not want to do straight pipes and I dont think cutouts will work.
I have chassis #368 and it looks to be the original side pipes. The sound is nice at the higher rpms, but pretty quiet at idle...or at least quieter than I would like. I read a few older post that talked about the restrictive side pipes on the older cobras.
Just did not know if someone has already had work done to the older Backdrafts and could lead me in the right direction, or give me some ideas.
Trying to get ready for the driving season.
__________________
Thanks,
Rob in Ohio
Reply With Quote
  #2 (permalink)  
Old 01-18-2020, 04:59 PM
bobcowan's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Feb 2007
Location: Colorado Springs, CO
Cobra Make, Engine: Backdraft, supercharged Coyote
Posts: 2,430
Not Ranked     
Default

Put in a bigger engine. Or install a Thumper cam.
__________________
.boB "Iron Man"
NASA Rocky Mountain TTU #42
www.RacingtheExocet.com
BDR #1642 - Supercharged Coyote, 6 speed Auto
Reply With Quote
  #3 (permalink)  
Old 01-18-2020, 05:37 PM
Dwight's Avatar
Senior Club Cobra Member
Visit my Photo Gallery

 
Join Date: May 2001
Location: Florence, AL
Cobra Make, Engine: RCR GT 40 & 1966 Fairlane 390 5 speed
Posts: 4,511
Not Ranked     
Smile

three inch Classic Cobra pack mufflers. We have used them on three or four Cobras. Worth every penny we paid!


Classic Chambered Exhaust Inc. - Sights & Sounds
__________________
''Life's tough.....it's even tougher if you're stupid.'' ~ John Wayne
"Happiness Is A Belt-Fed Weapon"
life's goal should be; "to be smarter than inanimate objects"
Reply With Quote
  #4 (permalink)  
Old 01-18-2020, 05:40 PM
Dwight's Avatar
Senior Club Cobra Member
Visit my Photo Gallery

 
Join Date: May 2001
Location: Florence, AL
Cobra Make, Engine: RCR GT 40 & 1966 Fairlane 390 5 speed
Posts: 4,511
Not Ranked     
Smile

You did not tell us anything about your motor.

Bob is correct.

Maybe you need to change the cam. Or motor.

Changing the side pipes is the cheapest and easies to do. Then if you want more, then do the mods to the motor.
__________________
''Life's tough.....it's even tougher if you're stupid.'' ~ John Wayne
"Happiness Is A Belt-Fed Weapon"
life's goal should be; "to be smarter than inanimate objects"
Reply With Quote
  #5 (permalink)  
Old 01-18-2020, 05:56 PM
Bucknut56's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Feb 2018
Location: Liberty Township, OH
Cobra Make, Engine: Backdraft #368
Posts: 17
Not Ranked     
Default

Motor is a 302.
I may be one of the unusual cobra drivers as I am not looking for speed at all. I do not drive fast. I mainly drive in a suburban area with speeds around 35-50.
It actually sounds great at idle with a very nice deep "lope" to it. I would just like it to be louder. I dont really think its the cam I just think the pipes are very restricted,and that seems to be what I read from some older post.
The pipes would be the easiest thing to change.
When I get a bigger motor it will be surrounded by a newer backdraft.
I always tell my wife that this is not "the" cobra, just "the" 1st cobra.
Then I will just have a newer cobra with a bigger motor to drive slow in LOL
__________________
Thanks,
Rob in Ohio
Reply With Quote
  #6 (permalink)  
Old 01-18-2020, 07:04 PM
FredG's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Sep 2018
Location: Howell, NJ
Cobra Make, Engine: Backdraft Car #1209 Roush 427R
Posts: 604
Not Ranked     
Default Loud

I have car 1209 with a Roush 427r - 550 hp and it is plenty loud...so loud you could never put a radio in it or talk on a bluetooth phone. Its near impossible to carry on a conversation when cruising over 40mph.

Fred
Reply With Quote
  #7 (permalink)  
Old 01-19-2020, 07:28 AM
Varmit's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Sep 2011
Location: Loudon, Tn
Cobra Make, Engine: Superformance#2352/Aluminum SO/490 c.i. 650 h.p. 605 tq.
Posts: 410
Not Ranked     
Default

Contact Ron Roberts at Firefly he can accommodate you
I have an aluminum FE bored and stroked to 490 with a healthy solid roller in it
You can hear it over a group of Cobras running a pack!!!
__________________
The Cannons don't thunder, there's nothing to plunder, I'm an over forty victim of fate
Reply With Quote
  #8 (permalink)  
Old 01-19-2020, 10:02 AM
Dwight's Avatar
Senior Club Cobra Member
Visit my Photo Gallery

 
Join Date: May 2001
Location: Florence, AL
Cobra Make, Engine: RCR GT 40 & 1966 Fairlane 390 5 speed
Posts: 4,511
Not Ranked     
Smile

My first Cobra had a 302 with 2 3/4" I.D. mufflers, 24" long with the louver turned backward so they would not scoop the air into the fiberglass packing. They were not mufflers as installed. More like straight pipes.
Very loud.

I left a friend house one evening and when I got onto the main hiway I walked it through three gears before easing off. When I got home he called me and said "Man, you sounded great on the hiway." I asked how far his house was from the hiway, he replied "one and a half miles." I asked how did you hear me that far with trees and houses between us. He told me he waited in the driveway because he knew I would get on it when I hit the main road.
My pipes were loud.
And then there is a story about a cop who heard me in 1st gear from three blocks away. I've got pictures.
And there was a time at the London Cobra show when they were dyno'ing my car and we shut down the tent activities for several minutes.
Oh, the time at London on Main st when they were dyno-ing my car, well you get the idea. It was very loud!

Later I bought a pair of the Classic pipes, four inches longer with 3" inside and turned the louvers so they would scoop the air as designed. They had a good rumble but at 60 - 70 mph we could carry on a conversation.
__________________
''Life's tough.....it's even tougher if you're stupid.'' ~ John Wayne
"Happiness Is A Belt-Fed Weapon"
life's goal should be; "to be smarter than inanimate objects"
Reply With Quote
  #9 (permalink)  
Old 01-20-2020, 12:16 PM
CC Member
Visit my Photo Gallery

 
Join Date: May 2015
Location: Mokena, IL
Cobra Make, Engine: Backdraft SBF-302
Posts: 321
Not Ranked     
Default

Check the sponsor Gas-n
At least they fit to a BDR.

My 302 rumbles, I've been asked many times if it's large displacement.
The FlowMasters I used have been discontinued.
Reply With Quote
  #10 (permalink)  
Old 01-20-2020, 06:17 PM
CC Member
Visit my Photo Gallery

 
Join Date: Dec 2003
Location: QUINLAN, TX
Cobra Make, Engine: BDR 89 KEITH CRAFT ALL ALUMINUM 427 WINDSOR
Posts: 273
Not Ranked     
Default

I used some straight pipes from DR Gas and welded in a vortech cone, not completely straight pipe and it had a very healthy sound. Loved setting off car alarms and waking up the dead when I buzzed her to 7500 rpm's. LOL It wasn't very expensive and really looked good when having them chromed. Picked up almost 100 horsepower since removing "restriction" out of exhaust.

Last edited by DC COBRA; 01-20-2020 at 06:20 PM..
Reply With Quote
  #11 (permalink)  
Old 01-20-2020, 06:53 PM
CC Member
Visit my Photo Gallery

 
Join Date: Dec 2015
Posts: 1,442
Not Ranked     
Default

This article on 50 free horsepower is still one of my favorites.

50 Free HP
Tom Wells likes this.
Reply With Quote
  #12 (permalink)  
Old 01-21-2020, 05:24 AM
CC Member
Visit my Photo Gallery

 
Join Date: Dec 2003
Location: QUINLAN, TX
Cobra Make, Engine: BDR 89 KEITH CRAFT ALL ALUMINUM 427 WINDSOR
Posts: 273
Not Ranked     
Default

Yes that article is hilarious. Early backdrafts like mine had some seriously restricted sidepipe mufflers. chassis dynoed it with the spunky 427 produced only about 360 horses. Installed my idea of sidepipe and then dynoed 457 horses after a little tuning. The sound although was amazing, no longer sounded like it was wheezing. At the time you could buy some nice sidepipes with nice mufflers that wasn't very restricted but they cost about 1600. Wasn't for me.
Reply With Quote
  #13 (permalink)  
Old 01-21-2020, 06:05 AM
CC Member
Visit my Photo Gallery

 
Join Date: Dec 2015
Posts: 1,442
Not Ranked     
Default

Yes, your spot on about the BDR mufflers being restrictive. Mine had two 7/8" dia tubes thru the center. I switched to Flowmaster stainless mufflers and am very happy with the results.
Ozzie Goat likes this.
Reply With Quote
  #14 (permalink)  
Old 01-21-2020, 05:54 PM
CC Member
Visit my Photo Gallery

 
Join Date: Dec 2003
Location: QUINLAN, TX
Cobra Make, Engine: BDR 89 KEITH CRAFT ALL ALUMINUM 427 WINDSOR
Posts: 273
Not Ranked     
Default

Yep the early ones were pathethically restrictive, doesn't sound like they improved any either. The dyno doesn't lie, open them babies up and let her sing. I was envious with the Harley crowd, they couldn't compete with the sweet sound. LOL
Reply With Quote
  #15 (permalink)  
Old 01-22-2020, 07:02 AM
bobcowan's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Feb 2007
Location: Colorado Springs, CO
Cobra Make, Engine: Backdraft, supercharged Coyote
Posts: 2,430
Not Ranked     
Default

A while back I installed a set of Classic Chambered Exhaust Cobra mufflers on a 427W. Made a huge improvement in sound quality. The FFR mufflers were harsh and "blatty". And very loud. The new mufflers had a much smoother sound, more mellow, like an old 60's muscle car. Huge improvement.

They looked a lot better, too.

Not sure if it made more power though, as I made other changes at the same time.



DC COBRA likes this.
__________________
.boB "Iron Man"
NASA Rocky Mountain TTU #42
www.RacingtheExocet.com
BDR #1642 - Supercharged Coyote, 6 speed Auto
Reply With Quote
Reply

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -7. The time now is 04:06 AM.


Powered by vBulletin® Version 3.8.0
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.6.0
The representations expressed are the representations and opinions of the clubcobra.com forum members and do not necessarily reflect the opinions and viewpoints of the site owners, moderators, Shelby American, any other replica manufacturer, Ford Motor Company. This website has been planned and developed by clubcobra.com and its forum members and should not be construed as being endorsed by Ford Motor Company, or Shelby American or any other manufacturer unless expressly noted by that entity. "Cobra" and the Cobra logo are registered trademarks for Ford Motor Co., Inc. clubcobra.com forum members agree not to post any copyrighted material unless the copyrighted material is owned by you. Although we do not and cannot review the messages posted and are not responsible for the content of any of these messages, we reserve the right to delete any message for any reason whatsoever. You remain solely responsible for the content of your messages, and you agree to indemnify and hold us harmless with respect to any claim based upon transmission of your message(s). Thank you for visiting clubcobra.com. For full policy documentation refer to the following link: CC Policy
Links monetized by VigLink