H-pipe question
Thread Starter
Burning Brakes
Joined: Feb 2006
Posts: 841
Likes: 0
From: High Desert California
H-pipe question
I just had true duals done with 2 1/2 pipes and no cat out through flowmasters 40s. In the beginning, it sounded real cool, sounded like a big block. But now the kids are telling me that it's too loud, like "ticket loud" that most likely I'll be stopped by the cops. Someone told me that installing an H-pipe will muffle it down a bit. Is this true? Or should I have a new cat installed? I know the cat will muffle it down a lot.
Safety Car
Joined: Nov 2005
Posts: 3,961
Likes: 573
From: Lompoc, CA. Santa Barbara County
Try the H pipe before you do anything else expensive. I had a "too loud" system once. We added an H pipe and it mellowed very nicely. Something else changed too. It was a Monza system that exhausted straight back. Before the H pipe, you could feel the exhaust flow more than 10 feet back. After the H pipe install, you had to get closer than five feet away to feel the flow. The H pipe also added some seat of the pants power.
Thread Starter
Burning Brakes
Joined: Feb 2006
Posts: 841
Likes: 0
From: High Desert California
Great insights!!!!!
Thanks a lot guys. I guess I'll do just that and install an H-pipe. The cops pull me over, that's it, no cat (not unless i take my tabby with me......lol)
Thanks a lot guys. I guess I'll do just that and install an H-pipe. The cops pull me over, that's it, no cat (not unless i take my tabby with me......lol)
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,445
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
My sytem much like yours was way to loud. So i took it to a muffler shop and had the guy weld in a four inch diameter pipe that he ovaled out on a machine. 4 inch has lots more flow back and forth than your 2.5 inch. He just lined it out and welded it in where my pipes were only 6 inches apart under the differential.
it did a nice job of mellowing out the sound
it did a nice job of mellowing out the sound
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,445
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
I will post a picture later... Th muffler guy upon my suggestion just smash down on the pipe that he had cut to correct length. He outlined it with the white welding marker and cut the 2 inch by about 6 inch piece out with a plasma cutter. Then he just wire feed (MIGed) in the cross pipe
Last edited by gkull; Jun 5, 2006 at 04:04 PM.
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Safety Car
Joined: Nov 2005
Posts: 3,961
Likes: 573
From: Lompoc, CA. Santa Barbara County
Originally Posted by gkull
My sytem much like yours was way to loud. So i took it to a muffler shop and had the guy weld in a four inch diameter pipe that he ovaled out on a machine. 4 inch has lots more flow back and forth than your 2.5 inch. He just lined it out and welded it in where my pipes were only 6 inches apart under the differential.
it did a nice job of mellowing out the sound
it did a nice job of mellowing out the sound
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,445
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
Originally Posted by Bee Jay
Are you saying that having a crossover pipe that is larger in diameter than the primary exhaust pipes has certain advantages? That is news to me. I can do that easily.
I originally tried to figure out doing 2.5 or 3 inch off the collectors and merge them into one 5 or 6 inch for 8 inches then back out to dual mufflers. This little 8 inch piece would take some time welding, so I gave up on it
