Exhaust questions
Thread Starter
Pro
Joined: May 2015
Posts: 552
Likes: 37
From: Westlake, OH & Melbourne, FL
Exhaust questions
We bought our '07 m6 coupe with a Billy Boat PRT axle back exhaust. Are we now best off by using their headers and pipes, if we choose to change the rest of the exhaust. What might our hp gains be (ballpark), if we went that route? The car is otherwise stock, no tune.
Drifting
Joined: Feb 2014
Posts: 1,418
Likes: 267
From: Pontiac Quebec
American Racing headers and kooks seem to make make the most gains. Go with either along with the matching x-pipe and your axle backs will fit right in.
It's hard to say but headers will typically give you between 20-30hp and that makes them the single best "bolt-on" mod
It's hard to say but headers will typically give you between 20-30hp and that makes them the single best "bolt-on" mod
Drifting
Joined: Feb 2014
Posts: 1,418
Likes: 267
From: Pontiac Quebec
yes that's right. the aftermarket headers + mid pipe are designed to fit with the oem axle back, and the axle backs are designed to work oem or after market mid sections. my only concern would be diameter. what you have now is likely 2.5 to 3 inches at the joint where your axle back connects. after market headers + mid will be 3 inches and hopefully no one cut things on the axle back side to make it fit. any good muffler shop could easily join the 2 if that's the case though.
Thread Starter
Pro
Joined: May 2015
Posts: 552
Likes: 37
From: Westlake, OH & Melbourne, FL
I'll check tomorrow, I think this will be my winter project, the timing hardly matters, as the car will not be on the road in our NE Ohio winter anyway.
Once again, thanks to all, for the responses.
Once again, thanks to all, for the responses.
Instructor
Joined: Mar 2019
Posts: 168
Likes: 53
From: Mooresville, IN
I'd say headers, X-pipe, and tune. That will provide 35 - 50 HP increase and provide a great platform for future mods (cam, etc.).
Doing a cam without headers / intake mods is, in my opinion, putting the cart before the horse..... the engine's gotta' breathe to be able to benefit from a cam swap!
just my 2 cents....
Doing a cam without headers / intake mods is, in my opinion, putting the cart before the horse..... the engine's gotta' breathe to be able to benefit from a cam swap!
just my 2 cents....
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