Exaust going on next week....question about tubing sizes
Exaust going on next week....question about tubing sizes
I'm having a local shop fab up a mandrel bent catback for me.
My question has to deal w/ the tubing sizes. I believe the stock main pipe is 2.25" that has the crimped section.
There's a couple ways for me to have them do the exhaust.
1) 2" main pipe split into 2" tubes for each muffler
2) 2.25" main pipe split into two 2.25" tubes for each muffler
3) 2.5" main pipe split into 1.875"-2" tubes for the muffler (cattmans spec's)
Any suggestions? I'm leaning towards #3 but figured I'd throw it out here and see what others had to say
Current performance mods are Fujita CAI, IM spacers, cattman y-pipe.
My question has to deal w/ the tubing sizes. I believe the stock main pipe is 2.25" that has the crimped section.
There's a couple ways for me to have them do the exhaust.
1) 2" main pipe split into 2" tubes for each muffler
2) 2.25" main pipe split into two 2.25" tubes for each muffler
3) 2.5" main pipe split into 1.875"-2" tubes for the muffler (cattmans spec's)
Any suggestions? I'm leaning towards #3 but figured I'd throw it out here and see what others had to say
Current performance mods are Fujita CAI, IM spacers, cattman y-pipe.
Last edited by JG1; Oct 5, 2007 at 09:25 AM.
$350 for mandrel bent piping including a resonator and all installation. I paid $275 (total) for these
So $625 for a full catback exhaust installed. Cattman is like $900 (delivered) plus I have to do the installation. I also don't like the mufflers cattman uses.
Joined: May 2005
Posts: 10,197
From: Displaced New Yorker in Southern, MD
No it's not.
$350 for mandrel bent piping including a resonator and all installation. I paid $275 (total) for these
So $625 for a full catback exhaust installed. Cattman is like $900 (delivered) plus I have to do the installation. I also don't like the mufflers cattman uses.
$350 for mandrel bent piping including a resonator and all installation. I paid $275 (total) for these
So $625 for a full catback exhaust installed. Cattman is like $900 (delivered) plus I have to do the installation. I also don't like the mufflers cattman uses.
good choice... sounds sick! 625 is nto bad at all.. GL and post some pics and more info
For a turbo setup your good to good w/ that size piping.
Joined: May 2005
Posts: 10,197
From: Displaced New Yorker in Southern, MD
And depending on weather (I have a 5AT), I run High 13's or Low 14's on the track...
No it's not.
$350 for mandrel bent piping including a resonator and all installation. I paid $275 (total) for these
So $625 for a full catback exhaust installed. Cattman is like $900 (delivered) plus I have to do the installation. I also don't like the mufflers cattman uses.
$350 for mandrel bent piping including a resonator and all installation. I paid $275 (total) for these
So $625 for a full catback exhaust installed. Cattman is like $900 (delivered) plus I have to do the installation. I also don't like the mufflers cattman uses.
Joined: May 2005
Posts: 10,197
From: Displaced New Yorker in Southern, MD
And I'll bet Warren "Ramberg" is faster, he has the same setup as my current one and he has NOS!!! There's also another 6th Genner in the DC area that I have raced with at Capital and on Juice he runs in the Mid-High 13's also.
Headers, CAI, UPD, IM Spacers, Cattback, Ported/Polished IM and Dyno Tuning with an APEXi Super AFC-II all contibute!!!
And I'll bet Warren "Ramberg" is faster, he has the same setup as my current one and he has NOS!!! There's also another 6th Genner in the DC area that I have raced with at Capital and on Juice he runs in the Mid-High 13's also.
And I'll bet Warren "Ramberg" is faster, he has the same setup as my current one and he has NOS!!! There's also another 6th Genner in the DC area that I have raced with at Capital and on Juice he runs in the Mid-High 13's also.
Joined: May 2005
Posts: 10,197
From: Displaced New Yorker in Southern, MD
Newbie just Registered
Joined: May 2005
Posts: 2,795
From: LA/OC, CA
I'm having a local shop fab up a mandrel bent catback for me.
My question has to deal w/ the tubing sizes. I believe the stock main pipe is 2.25" that has the crimped section.
There's a couple ways for me to have them do the exhaust.
1) 2" main pipe split into 2" tubes for each muffler
2) 2.25" main pipe split into two 2.25" tubes for each muffler
3) 2.5" main pipe split into 1.875"-2" tubes for the muffler (cattmans spec's)
Any suggestions? I'm leaning towards #3 but figured I'd throw it out here and see what others had to say
Current performance mods are Fujita CAI, IM spacers, cattman y-pipe.
My question has to deal w/ the tubing sizes. I believe the stock main pipe is 2.25" that has the crimped section.
There's a couple ways for me to have them do the exhaust.
1) 2" main pipe split into 2" tubes for each muffler
2) 2.25" main pipe split into two 2.25" tubes for each muffler
3) 2.5" main pipe split into 1.875"-2" tubes for the muffler (cattmans spec's)
Any suggestions? I'm leaning towards #3 but figured I'd throw it out here and see what others had to say
Current performance mods are Fujita CAI, IM spacers, cattman y-pipe.
I had asked him threw PM's and he said 2" from the resonator back to the mufflers. Maybe he's running 2.25" into the resonator and 2" out...
Do you happen to know the stock size of the piping going to each muffler (after the split)? Is that 2.25" as well?
Do you happen to know the stock size of the piping going to each muffler (after the split)? Is that 2.25" as well?
Newbie just Registered
Joined: May 2005
Posts: 2,795
From: LA/OC, CA
Yes, mandrel bent; I think that's why there's the crimp section before the split.
How bout Option 4: Single 2.5" exhaust back to single larger muffler. I have heard that the single muffler makes more power and sounds better. It is cheaper and, of course, is lighter weight. The disadvantage is that it makes the rear unsymmetrical which some people don't like. The solution is to make a "dummy muffler" so it looks like there are two mufflers.
I am considering this as an alternative exhaust, possibly for track only. Im not sure yet.
I am considering this as an alternative exhaust, possibly for track only. Im not sure yet.
Quoted from an email from Brian:
"Every once in a while I’ll hear some “common knowledge” that’s just profoundly incorrect. I can’t even imagine how a part like this would lose power. I know from our experience that its quite difficult to design an exhaust part for VQ engines that loses power, it is very “immune” to a lack of backpressure. I simply do not believe that this is true.
These rumors typically get started because someone compares dyno runs that aren’t comparable. Unfortunately, most vehicle owners (and a lot of dyno shops) are profoundly ignorant about setting up dyno tests properly so that the major variables are controlled and the before and after results are comparable. They end up with absurdly over- or under-stated results, don’t recognize them as such or understand why they got the oddball results, and trot those numbers out as the gospel truth.
Obviously we don’t test the Greddy, but we know that our catback with a 2.5” main tube routinely makes 10-12whp. The ideal setup is a full exhaust system – header set and y-pipe (designed together, as ours are) and catback exhaust.
Brian C Catts
Cattman Perfornance"
"Every once in a while I’ll hear some “common knowledge” that’s just profoundly incorrect. I can’t even imagine how a part like this would lose power. I know from our experience that its quite difficult to design an exhaust part for VQ engines that loses power, it is very “immune” to a lack of backpressure. I simply do not believe that this is true.
These rumors typically get started because someone compares dyno runs that aren’t comparable. Unfortunately, most vehicle owners (and a lot of dyno shops) are profoundly ignorant about setting up dyno tests properly so that the major variables are controlled and the before and after results are comparable. They end up with absurdly over- or under-stated results, don’t recognize them as such or understand why they got the oddball results, and trot those numbers out as the gospel truth.
Obviously we don’t test the Greddy, but we know that our catback with a 2.5” main tube routinely makes 10-12whp. The ideal setup is a full exhaust system – header set and y-pipe (designed together, as ours are) and catback exhaust.
Brian C Catts
Cattman Perfornance"
Depending on what you got up front on the engine or plan on. I don't know you mods.
Do you have the new Cattman y pipe? I have a stock one but replaced the crimped section after the resonator. What I don't know about, is if the stock resonator is restrictive, http://www.hottexhaust.com/detail.asp?PRODUCT_ID=14444). If it is you can replace it then top it off with the wicked mufflers you just bought. I bet it would work just fine.
I also think there may be something to that single exhaust. Knowing Deus he'll figure it out one way of the other. Always blazing a trail
Newbie just Registered
Joined: May 2005
Posts: 2,795
From: LA/OC, CA
The stock resonator has a restriction at entry, and the crimp section before the split also reduces the flow at higher RPM. I make power with stock mufflers, with new piping and resonator; 12 WHP with K&N panel filter. It's not as much as headers, but definitely an improvement.
The stock resonator has a restriction at entry, and the crimp section before the split also reduces the flow at higher RPM. I make power with stock mufflers, with new piping and resonator; 12 WHP with K&N panel filter. It's not as much as headers, but definitely an improvement.
Newbie just Registered
Joined: May 2005
Posts: 2,795
From: LA/OC, CA
That's where it's at. 
Glude, where you at?
