Aftermarket Headers and Midpipe for Boss 302 - Ford Mustang Forum
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post #1 of 7 (permalink) Old 03-08-2018 Thread Starter
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Aftermarket Headers and Midpipe for Boss 302

So I put the side pipes and OEM H-pipe off a Boss 302 onto my 2011 GT (yes its possible). My question is what companies sell long tube headers with a corresponding x/h pipe that will support the side pipes? I want to keep them as to why i bought them but also want LTH. The only company i know of that offers such a thing is Kooks and for the headers and mid pipe is right around 2 grand. Any others?

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post #2 of 7 (permalink) Old 03-10-2018
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https://www.lethalperformance.com/ko...e-headers.html

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post #3 of 7 (permalink) Old 03-11-2018
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There arenít any that are particularly affordable. Like you, I also installed the Boss midpipe on my 2011. Gotta remember that the 2012-13 boss mustangs are ALOT less common than the 11-14 GTs. Therefore, supply and demand will apply. The difference in mid-pipes is literally just having the provisions for the side pipes welded onto them. Honestly, you might consider having flanges made and welded onto a GT midpipe by a muffler shop if you want to keep the side pipes. Will be cheaper in the long run. For me, I donít plan on installing long tubes as of right now so the stock Boss H-pipe is fine for me. We will see how it sounds with some cat-deletes I just picked up. Thereís no real gain in having the side pipes. Theyíre for noise and nothing else. Thatís why most Boss guys who swap exhaust just sell their sidepipes because if you go full exhaust, itís plenty loud.

2011 GT Premium 6-Speed
GO:S550 Longblock, Boss 302 Intake Manifold, Boss 302 Exhaust Cams, Airiad CAI, Boss 302 H-Pipe and Side Pipes, Borla S-Type Axlebacks
SHOW:GT350 20Ē Wheels, California Special/Boss Rear Spoiler, LED Marker Lights, S550 Style Headlights with HIDs
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post #4 of 7 (permalink) Old 03-11-2018
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Originally Posted by G.O. Stang View Post
There arenít any that are particularly affordable. Like you, I also installed the Boss midpipe on my 2011. Gotta remember that the 2012-13 boss mustangs are ALOT less common than the 11-14 GTs. Therefore, supply and demand will apply. The difference in mid-pipes is literally just having the provisions for the side pipes welded onto them. Honestly, you might consider having flanges made and welded onto a GT midpipe by a muffler shop if you want to keep the side pipes. Will be cheaper in the long run. For me, I donít plan on installing long tubes as of right now so the stock Boss H-pipe is fine for me. We will see how it sounds with some cat-deletes I just picked up. Thereís no real gain in having the side pipes. Theyíre for noise and nothing else. Thatís why most Boss guys who swap exhaust just sell their sidepipes because if you go full exhaust, itís plenty loud.

Heck taking out the restricter in the Boss 302 side pipes makes it more than loud enough. Just sold my Boss 302 and it had the restricter plates in the side pipes out and man it was loud when you laid into it. haha

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Past Mustangs in order and color of text.
(1.)2000, (2.)2004, (3.)2006GT/Auto traded for (4.)2006GT/Manual, (5.)1996, (6.)2011GT, (7.)2003GT, (8.)2006GT, (9)2013 Boss 302, and (10.) 2002GT
(I have owned a few non Mustang cars over the years as well, but always try to have a Mustang with it or come quickly back to a Mustang!)
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post #5 of 7 (permalink) Old 03-11-2018
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Originally Posted by MustangLife View Post
Heck taking out the restricter in the Boss 302 side pipes makes it more than loud enough. Just sold my Boss 302 and it had the restricter plates in the side pipes out and man it was loud when you laid into it. haha


See, Iíve never even owned the restricters. And I donít really find them all that loud really. But Iím also running a Borla axle back which is much more free flowing than the stock mufflers so less is coming out of those side pipes. They do sound nice though. Lol

2011 GT Premium 6-Speed
GO:S550 Longblock, Boss 302 Intake Manifold, Boss 302 Exhaust Cams, Airiad CAI, Boss 302 H-Pipe and Side Pipes, Borla S-Type Axlebacks
SHOW:GT350 20Ē Wheels, California Special/Boss Rear Spoiler, LED Marker Lights, S550 Style Headlights with HIDs
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post #6 of 7 (permalink) Old 03-11-2018
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Originally Posted by G.O. Stang View Post
See, Iíve never even owned the restricters. And I donít really find them all that loud really. But Iím also running a Borla axle back which is much more free flowing than the stock mufflers so less is coming out of those side pipes. They do sound nice though. Lol
Yeah I bought the car without the restricters in so I don't know the difference 100%, but I know mine was much louder than the others I heard pass by with the restricters I assume in. Did you buy yours used or new? If new how odd they didn't come with the restricters... I was running stock exhaust other than the restricters all the way out so I bet majority of exhaust came out my side pipes which made them LOUD! haha

Current Garage
(11.)2012 GT500 silver with red stripe, SVT performance package, and Recaro seats.
2018 Honda Civic Type R
Past Mustangs in order and color of text.
(1.)2000, (2.)2004, (3.)2006GT/Auto traded for (4.)2006GT/Manual, (5.)1996, (6.)2011GT, (7.)2003GT, (8.)2006GT, (9)2013 Boss 302, and (10.) 2002GT
(I have owned a few non Mustang cars over the years as well, but always try to have a Mustang with it or come quickly back to a Mustang!)
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post #7 of 7 (permalink) Old 03-11-2018
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Originally Posted by MustangLife View Post
Yeah I bought the car without the restricters in so I don't know the difference 100%, but I know mine was much louder than the others I heard pass by with the restricters I assume in. Did you buy yours used or new? If new how odd they didn't come with the restricters... I was running stock exhaust other than the restricters all the way out so I bet majority of exhaust came out my side pipes which made them LOUD! haha


I bought mine used from a local guy who took them off his low mile Boss. He tracked the car a lot so he had removed the restricters and tossed them. Lol
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2011 GT Premium 6-Speed
GO:S550 Longblock, Boss 302 Intake Manifold, Boss 302 Exhaust Cams, Airiad CAI, Boss 302 H-Pipe and Side Pipes, Borla S-Type Axlebacks
SHOW:GT350 20Ē Wheels, California Special/Boss Rear Spoiler, LED Marker Lights, S550 Style Headlights with HIDs
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