Classic Chambered Exhaust

[bermblaster41]

Update on my side pipes. For future Classic chamber customers here is what I wish I had done different. I decided to go with the reducer to smooth out the transition from 3.5" down to 3". I would suggest ordering without the inlet welded in. I had to cut the weld and grind away the weld to pull the sleeve out. Not impossible but time consuming. For the guys that are not clear on the procedure look in my photo gallery for pics. The quality isn't great due to I used my phone for the pics. Progress pics and video to follow. Berm

[Rare Iron]

Berm, just chop off the muffler inlet til there is about 1/2" left. Then cut-down the 3" ID side of the reducer & butt-weld it to the muffler inlet. Then cut the adapter right where it starts to transition from 3.5" OD to the 3" & then you can grind & finesse it until it slips just inside the collector. Everything will hide inside the collector & all you'll have to do is weld the muffler to the collector. If I build the Cobrapacks as blanks (no necks), then you may not get as smooth of a transition, plus the weld at the muffler neck also secures the core of the muffler in place. Either way, if you don't have a chop saw, it makes the whole procedure a little more difficult.

Merry Christmas everybody..................

[RonNichols]

Originally Posted by Rare Iron

Berm, just chop off the muffler inlet til there is about 1/2" left. Then cut-down the 3" ID side of the reducer & butt-weld it to the muffler inlet. Then cut the adapter right where it starts to transition from 3.5" OD to the 3" & then you can grind & finesse it until it slips just inside the collector. Everything will hide inside the collector & all you'll have to do is weld the muffler to the collector. If I build the Cobrapacks as blanks (no necks), then you may not get as smooth of a transition, plus the weld at the muffler neck also secures the core of the muffler in place. Either way, if you don't have a chop saw, it makes the whole procedure a little more difficult.

Merry Christmas everybody..................

This is about how I modified my muffler. I wish I would have taken a picture when I did mine as it would have been worth a thousand words.

R

[undy]

Rare,

I'm thinking of of dumping my 4" non-packed setup I have and getting rid of the 4" collectors too. I'm thinking about a set your 3" Cobrapacks with a nice set of Kooks or Dynatech 2" primary by 3" outlet true merge collecters. I've got a couple questions about the swap, if you will. How much horsepower will I lose in the switch from the 3" Cobrasticks to the 3" Cobrapacs? In your opinion, do you think the merge collectors are worth the trouble? If so, how much gain do you think they'll actually provide? Figure a tad over 600 horsepower capability as a base line.

Dave

[RonNichols]

Originally Posted by undy

Rare,

I'm thinking of of dumping my 4" non-packed setup I have and getting rid of the 4" collectors too. I'm thinking about a set your 3" Cobrapacks with a nice set of Kooks or Dynatech 2" primary by 3" outlet true merge collecters. I've got a couple questions about the swap, if you will. How much horsepower will I lose in the switch from the 3" Cobrasticks to the 3" Cobrapacs? In your opinion, do you think the merge collectors are worth the trouble? If so, how much gain do you think they'll actually provide? Figure a tad over 600 horsepower capability as a base line.

Dave

Dave,

Not that you're asking me, but I'll interject anyways. For the money, you can't beat the cost of the Megs' merge collector kit from Cone Engineering. I wondered how to get a slip on merge collector to work, and experimenting with a $300+ each collector not knowing if it would look or work well made me sick to even think about trying it. The megs venturi merge collector kit was less than a 1/3 of the cost and came out looking, in my mind, better than a Dynatech or Kooks. You can trim the divergent side of the collector to butt weld smoothly to the cobra pack muffler, or transition it internally.



Ronnie

[undy]

Originally Posted by RonNichols

Dave,

Not that you're asking me, but I'll interject anyways. For the money, you can't beat the cost of the Megs' merge collector kit from Cone Engineering. I wondered how to get a slip on merge collector to work, and experimenting with a $300+ each collector not knowing if it would look or work well made me sick to even think about trying it. The megs venturi merge collector kit was less than a 1/3 of the cost and came out looking, in my mind, better than a Dynatech or Kooks. You can trim the divergent side of the collector to butt weld smoothly to the cobra pack muffler, or transition it internally.


Ronnie

Thanks Ronnie, that's a sweet setup. I need to see who I know that has a tig welder. Paying a pro shop can lead to a lot of $$ for all that detail. I have a gas mig welder myself but it'll be like doing brain surgery with a Bowie knive. I don't weld enough to make it pretty anyway. Also, with my existing 4" collector I'll have to see if I could pull the primary bundle together tight enough to fit in the new collector. A couple large hose clamps around the primary tube bundle might pull it together. Cone Engineering has some pretty good instructions on their web site too. A little investigation is in order. Thanx for the info..

Dave

[Rare Iron]

Undy, you won't lose any more flow by going to the 3" packed Cobrapacks vs. the inserts I built for you, & you will quiet the exhaust down a lot. Like Ron & I stress, just make the transition into the muffler flowpath smooth & easy. You don't want to hit any "walls" which will cause a LOT of turbulence at the inlet of the mufflers. I've not had ANY negative feedback on the Cobrapacks since I introduced them to my line, & there's a bunch of Cobra owners using them now - probably over 100 cars running them.