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Old 04-02-2014, 07:24 PM   #1
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GT mid-pipe on V6

Hey guys! I found someone selling an oem gt h-pipe with cats for $20. I am planning on buying an aftermarket h-pipe, but I don't see why a gt h-pipe won't do the trick. I believe the gt h-pipe is 2.75 inches, same as after market h-pipes. Does anyone have any knowledge that can help me out?
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Old 04-02-2014, 08:23 PM   #2
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I want to say the V6 exhaust is 2.25 with aftermarket systems expanding to 2.5. I am unsure of the GT's diameter piping but you would probable need to get it fabricated with adapters to fit your V6. Also if it is indeed 2.75 I would be worried that it would be too big and you would lose some low end torque which the V6's already lack.
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Old 04-03-2014, 12:29 AM   #3
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Originally Posted by StarzTA17 View Post
I want to say the V6 exhaust is 2.25 with aftermarket systems expanding to 2.5. I am unsure of the GT's diameter piping but you would probable need to get it fabricated with adapters to fit your V6. Also if it is indeed 2.75 I would be worried that it would be too big and you would lose some low end torque which the V6's already lack.
+1
The aftermarket mid pipes for 3.7s are 2.5 so I might have to get it fabbed to work. There's someone on here that cut the stock h section off the 5.0 & replaced the hybrid section of his 3.7 & hated the sound..he said it sounded like an old truck..just something to consider.
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Old 04-03-2014, 02:25 AM   #4
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+1
The aftermarket mid pipes for 3.7s are 2.5 so I might have to get it fabbed to work. There's someone on here that cut the stock h section off the 5.0 & replaced the hybrid section of his 3.7 & hated the sound..he said it sounded like an old truck..just something to consider.

Good to know! Thanks a lot! I'll be stay away from these lol the last thing I want is to ruin the sound of my borlas
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Old 04-03-2014, 04:06 AM   #5
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Just cut the front connecting points and rear ones and weld them to the gt ones and ur good it will bolt up.

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Old 04-03-2014, 05:35 AM   #6
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Just cut the front connecting points and rear ones and weld them to the gt ones and ur good it will bolt up.

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By cutting larger diameter (5.0) and welding lower diameter (3.7) pipes in the front and back of the GT H-pipe may actually hurt performance, as this would disrupt the smooth flow of exhaust. This, IMO, would not be worth the 20 bucks plus welding labor costs to install.
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Old 04-03-2014, 06:19 AM   #7
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By cutting larger diameter (5.0) and welding lower diameter (3.7) pipes in the front and back of the GT H-pipe may actually hurt performance, as this would disrupt the smooth flow of exhaust. This, IMO, would not be worth the 20 bucks plus welding labor costs to install.
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Old 04-03-2014, 09:19 AM   #8
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By cutting larger diameter (5.0) and welding lower diameter (3.7) pipes in the front and back of the GT H-pipe may actually hurt performance, as this would disrupt the smooth flow of exhaust. This, IMO, would not be worth the 20 bucks plus welding labor costs to install.
This would actually help since he's adding piping way too big for a 3.7 even for F/I he needs to keep the inlet and outlet stock to keep the same back pressure. If not it'd be too free flowing and would lose power.

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Old 04-03-2014, 11:17 AM   #9
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So, should he just pass on installing the GT H-pipe and keep what he has for now?
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Old 04-03-2014, 11:23 AM   #10
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If he's just trying to add the H in there, could you have someone just cut and weld a pipe between the existing stock pipes, or is that a dumb idea?
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Old 04-03-2014, 11:24 AM   #11
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If he's just trying to add the H in there, could you have someone just cut and weld a pipe between the existing stock pipes, or is that a dumb idea?
Here's what I found as to the H-pipe/X-pipe debate...

"if you are building a high-horsepower drag machine your choice will be different than a mildly modded street car. If you need a boost in low end torque, pick up an h-pipe. If it's high end horsepower later in the rpm band you seek, an x-pipe is the way to go".
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Old 04-03-2014, 11:30 AM   #12
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Here's what I found as to the H-pipe/X-pipe debate...

"if you are building a high-horsepower drag machine your choice will be different than a mildly modded street car. If you need a boost in low end torque, pick up an h-pipe. If it's high end horsepower later in the rpm band you seek, an x-pipe is the way to go".

It's also supposed to help with scavenging. My brother put one on his 440-6 Pack Dart years ago. I think the X does the same thing, but the H has a deep tone vs. rasp with the X.
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Old 04-03-2014, 11:40 AM   #13
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The guy I talked about earlier that swapped the GT h section for the v6 hybrid section said he felt a loss in performance. I think his name was fintle or something like that!
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Old 04-03-2014, 12:09 PM   #14
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Thanks for all the help guys! I'm sure I can cut the h/pipe and get it to fit. I'm not worried about the loss in power, but trying to achieve a nice deep sound. I may even install LT headers in the future, however I'm not sure how that will effect the sound with an h-pipe. Is anyone running LT headers and and h-pipe??
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Old 04-03-2014, 12:17 PM   #15
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Just get your local muffler shop to convert your existing stock X-pipe to that of an H-pipe.
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Old 04-03-2014, 12:26 PM   #16
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Here is a picture of our stock exhaust. Do those pipes just meet one another where that X is but flow is completely independent of one another, or are they open inside that X? If they are open, then why isn't our stock exhaust raspy like an aftermarket X pipe is?

Click image for larger version

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Old 04-03-2014, 01:01 PM   #17
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I may even install LT headers in the future, however I'm not sure how that will effect the sound with an h-pipe. Is anyone running LT headers and and h-pipe??
I think one person on here is running a custom h-pipe with longtubes on their 3.7L. I will be in the near future once I get my car unfrozen. I've got the lethal off-road h-pipe now. I'm gonna get it modified into a shorty when I install my Borla xr1 longtube headers.
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Old 04-03-2014, 02:15 PM   #18
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Here is a picture of our stock exhaust. Do those pipes just meet one another where that X is but flow is completely independent of one another, or are they open inside that X? If they are open, then why isn't our stock exhaust raspy like an aftermarket X pipe?

Here's a pic of the h-pipe. As for the science behind why x-pipes have rasp is beyond me. Click image for larger version

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Old 04-03-2014, 02:17 PM   #19
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I think one person on here is running a custom h-pipe with longtubes on their 3.7L. I will be in the near future once I get my car unfrozen. I've got the lethal off-road h-pipe now. I'm gonna get it modified into a shorty when I install my Borla xr1 longtube headers.

Sounds awesome! Once you have that completed, you'll have to post a vid
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Old 04-03-2014, 03:29 PM   #20
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Sounds awesome! Once you have that completed, you'll have to post a vid
Thanks, I definitely plan on it. The rest of my setup is the Pype Bomb axlebacks and 22" glasspacks welded into the factory overaxle pipes.
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Old 04-05-2014, 05:19 PM   #21
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Originally Posted by 3.7L View Post
Hey guys! I found someone selling an oem gt h-pipe with cats for $20. I am planning on buying an aftermarket h-pipe, but I don't see why a gt h-pipe won't do the trick. I believe the gt h-pipe is 2.75 inches, same as after market h-pipes. Does anyone have any knowledge that can help me out?

I've got an aftermarket H pipe, it's 2.5"
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Old 04-05-2014, 05:32 PM   #22
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I've got an aftermarket H pipe, it's 2.5"

Thank you, that helps a lot!
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Old 04-05-2014, 05:40 PM   #23
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Thank you, that helps a lot!

No problem!
You can still fit the GT pipe, but you'd have to take it to a muffler shop for them to modify the openings.
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Old 04-05-2014, 06:00 PM   #24
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No problem!
You can still fit the GT pipe, but you'd have to take it to a muffler shop for them to modify the openings.
How different is your sound with your H pipe on idle and at WOT? -compared to factory hybrid h/x pipe?

I fellow forum member said his pretty deep at idle, but kinda flattened out at WOT.. Making it sound like a pick up truck. Also, I asked the same question to my exhaust guy and he was like the stock h/x mid pipe is way better than a proper H. Idk lol too much info

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Old 04-05-2014, 06:02 PM   #25
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How different is your sound with your H pipe on idle and at WOT? -compared to factory hybrid h/x pipe?

I fellow forum member said his pretty deep at idle, but kinda flattened out at WOT.. Making it sound like a pick up truck. Also, I asked the same question to my exhaust guy and he was like the stock h/x mid pipe is way better than a proper H. Idk lol too much info

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H was way deeper, it sound weird at WOT, check out my YouTube video of my 0-60
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Old 04-05-2014, 06:08 PM   #26
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Cheers thanks, I will. So it was weird.. As in?

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Old 04-05-2014, 07:06 PM   #27
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Cheers thanks, I will. So it was weird.. As in?

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Old 04-05-2014, 09:26 PM   #28
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Odd. I don't get a sound like that at WOT.
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Old 04-06-2014, 07:17 AM   #29
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If your looking for sound, I've been told shortys are the way to go and they also give you some low end torque where as the long tubes give you a few more hp and loss some low end tq
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Old 04-06-2014, 10:55 AM   #30
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Alrefire, you h-pipe is an off road catless right? I just wanna know as I'm gonna add an h-pipe but keep the cats.
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Old 04-06-2014, 10:58 AM   #31
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Alrefire, you h-pipe is an off road catless right? I just wanna know as I'm gonna add an h-pipe but keep the cats.

Yes, it's catless
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Old 05-05-2014, 02:29 AM   #32
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I am doing something similar except I am replacing my mid pipes (from the X back) and my muffler deletes for a stock GT setup. It is a simple pair of adapters welded to the mids to mate them to the X, after that its mostly stock setup.

I currently am running BBK shorties, stock X with cats and resonators, stock mids with magnapacks welded in with Pypes bombs in the rear. Mellow, very deep and very aggressive sounding. However I am having some alignment issues with the axle backs that I fixed a while back with my BBK X pipe but since I removed that they are all out of whack. So I am ditching the mid to axle backs. I will still get resonators with the GT mid pipes and I will have more muffler options with the 3" pipes and as long as I stay with a chambered muffler over a delete or pure strait through should not lose much or anything for being too open.
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