Exhaust Comparison

[Johnny Danger]

While taking some measurements of my cat back exhaust today (I have a modification in mind), I notice that the inlet and out diameters on the mufflers seemed quite large compared to most of the other aftermarket mufflers that I've come across - 3.5 inches (inlet) and 4.5 inches (outlet). I am curious to know this compares with some of the other aftermarket exhausts on the forum .

JD
p.s. Despite my penchant to be bawdy, this is not a "size matters" competition.

[manolo]

Yeah, besides its about girth, not length anyway. At least thats what the spam emails I get say...

[harryrcb]

Originally Posted by Johnny Danger

While taking some measurements of my cat back exhaust today (I have a modification in mind), I notice that the inlet and out diameters on the mufflers seemed quite large compared to most of the other aftermarket mufflers that I've come across - 3.5 inches (inlet) and 4.5 inches (outlet). I am curious to know this compares with some of the other aftermarket exhausts on the forum .

JD
p.s. Despite my penchant to be bawdy, this is not a "size matters" competition.

What car are we talking about? 3 1/2" inlet? 41/2 outlet ? I'm all about bigger but that size is good for diesel trucks

[Johnny Danger]

Originally Posted by harryrcb

What car are we talking about? 3 1/2" inlet? 41/2 outlet ? I'm all about bigger but that size is good for diesel trucks

An '02 S - 3.2 .

[harryrcb]

Originally Posted by Johnny Danger

An '02 S - 3.2 .

the 02 S stock exhaust inlets are 1 3/4" and the outs are 1 7/8" with the stainless steel exhaust tips (ornamental pipes as Porsche calls them) are 3 1/2" so on my car I went to 2" pipes coming from the headers back with 2 1/2" out plus ornamental tips. I'm a little confused with what you have there or what you want to do with it, but it sounds like it's going to be toooooo big. The new engine I'm installing in my box now (3.8 dfi S) will have 2 1/2 pipes going back with 3" coming out.

[Johnny Danger]

Originally Posted by harryrcb

the 02 S stock exhaust inlets are 1 3/4" and the outs are 1 7/8" with the stainless steel exhaust tips (ornamental pipes as Porsche calls them) are 3 1/2" so on my car I went to 2" pipes coming from the headers back with 2 1/2" out plus ornamental tips. I'm a little confused with what you have there or what you want to do with it, but it sounds like it's going to be toooooo big. The new engine I'm installing in my box now (3.8 dfi S) will have 2 1/2 pipes going back with 3" coming out.

My "plumbing" runs 2.25 from the headers (no secondary cats) to the muffler inlet that gradually necks up from 3' to 3.5 at the inlet . The exit diameter from the muffler is 4.5 and it gradually necks down to about 4' at the tips . What can I say, this is how the crazy dudes at 9ff designed it. Since, they have set the top speed record for a production vehicle 2 or 3 times now, I have to defer to their judgement. The exhaust sounds great, but I'm considering ways to make it sound more aggressive. With that said, what I am trying to do is reduce the size of the mufflers by installing ones that are smaller in size and diameter. The problem that I am encountering is finding something that is compatible with the inlet and outlet diameters. If I decide to eliminate them altogether and weld in some straight pipes, I'm afraid I'll end up with something that requires me to radio Cape Canaveral before I head out on a drive !

[Lobo1186]

a 3.8 S DFI motor eh? how much did that run you, and what year box do you have?

[harryrcb]

Originally Posted by Johnny Danger

My "plumbing" runs 2.25 from the headers (no secondary cats) to the muffler inlet that gradually necks up from 3' to 3.5 at the inlet . The exit diameter from the muffler is 4.5 and it gradually necks down to about 4' at the tips . . The exhaust sounds great, but I'm considering ways to make it sound more aggressive. With that said, what I am trying to do is reduce the size of the mufflers by installing ones that are smaller in size and diameter. The problem that I am encountering is finding something that is compatible with the inlet and outlet diameters. If I decide to eliminate them altogether and weld in some straight pipes, I'm afraid I'll end up with something that requires me to radio Cape Canaveral before I head out on a drive !

I can imagine how loud it is or would be with straight pipes. I never heard of anyone doing pipes like that. Very interesting. did you get any dyno numbers before and aft? If they are available I would like to see them. If you want more volume why don't you replace the mufflers with aftermarket glasspacks or whatever they pack them with now or maxflow race mufflers. You can get those in almost all different confiurations.