Bigger exhaust and it made it worse

[Sinister redlines]

I just installed from where the exhaust goes from 2.5" to 2.25" manderal bent 2.5" pipe all the way out to a 2.5" stainless flowmaster. The sound is great not what I expected from a flowcan I thought it might sound like a honda but its definately is deeper and sounds better. However I lost a ton of torque and I dont think I really gained anything but being louder.

So I am curious about those who put 3" pipe in and what they experianced.
BTW even with a lift it still sucked to get the mandrel bends to work just right and get the welds perfect. Makes me wonder how much a pain in the butt 3" would be to get all the mandrel bends to work.

[johnboy8221]

Originally Posted by Sinister redlines

I just installed from where the exhaust goes from 2.5" to 2.25" manderal bent 2.5" pipe all the way out to a 2.5" stainless flowmaster. The sound is great not what I expected from a flowcan I thought it might sound like a honda but its definately is deeper and sounds better. However I lost a ton of torque and I dont think I really gained anything but being louder.

So I am curious about those who put 3" pipe in and what they experianced.
BTW even with a lift it still sucked to get the mandrel bends to work just right and get the welds perfect. Makes me wonder how much a pain in the butt 3" would be to get all the mandrel bends to work.

i don't know i don't think i lost any power i did the same thing ot mine except i used a borla instead of a flow master

[goofyguy]

i did 3 inch from the header to the dual outs. No power lost here. I can beat on a stock redline pretty bad.

[Blue N Boosted]

Originally Posted by goofyguy

i did 3 inch from the header to the dual outs. No power lost here. I can beat on a stock redline pretty bad.

would you of happened to have straight pipped your exhaust or did you go through the cats?

[goofyguy]

no cat. There is 3 inch off the header to a 3 inch in out resonator that 24 inches long then over the axel and splits into 2 2.5 inch mangaflow straight through mufflers. The mufflers will out flow the 3 inch pipe as well. There is no resistance in the system just some noise removing devices like the mufflers and the resonators.

[Blue04RedLine]

Currently thorugh the cat, but soon enough going to be gone; this weekend or sometime close I believe?

[Blubatmobile]

The only problem with going to a bigger pipe, is if you go to big, you will lose power. Everyone is always talking about how backpressure bad. A lot of it is, creating a restrictive exhaust. But backpressure is what makes torque. You have to have a certain amount of pressure so the engine can produce torque. You have to think of it as b/p being the load on the engine, if you take the load off, its going to breath TOO easy and its not going to make the power it should. I hope that kinda makes sense.
~Adam
QUOTE=Sinister redlines]I just installed from where the exhaust goes from 2.5" to 2.25" manderal bent 2.5" pipe all the way out to a 2.5" stainless flowmaster. The sound is great not what I expected from a flowcan I thought it might sound like a honda but its definately is deeper and sounds better. However I lost a ton of torque and I dont think I really gained anything but being louder.

So I am curious about those who put 3" pipe in and what they experianced.
BTW even with a lift it still sucked to get the mandrel bends to work just right and get the welds perfect. Makes me wonder how much a pain in the butt 3" would be to get all the mandrel bends to work.[/quote]

[zfactor]

okay lets get something first here. you are dealing with a supercharger. not a turbo. these are 2 very different animals!!! not similar in almost any way except both pumping air out of them. sc's work on the intake side of things. thier job is to suck more air in and pressurize it i.e.= more air= more oxygen = more fuel burned= more power. simple (well explaining it is ) just like a normally aspirated engine a sc needs some backpressure to maintane good flow and turbulance. yes i said that. there is a sort of phenonminom that happens inside pipes that have air flowing through them regarding the "tuning" or "frequency" of the air many use different terms for this but its all the same. harmonics. think of a large pipe organ at a church its really very similar. air will flow at different velocities at different tuning frequencies. i build competition subwoofer enclosures all day. we deal with the in car resonance, cabin gain etc... all which gets figured in to any real competition system. if you go to an installer and he doesnt do enough testing and research on your vehicle and you are paying him a lot of money GO ELSWHERE!! if they do not know what all this stuff is you will not win plain and simple. if you go to large on a all motor car you can and will kill your power very easily. you generally also will only gain anything and if you do it will usually come at the top of your rpm range. to big with a sc is not the way to do things. call any large sc company they will tell you the same thing maybe not word for word but it will come out the same. jackson, ripp, eaton, vortech, etc......
i could get into it more in depth and into turbo's as well but that another time and place

[Blue N Boosted]

Thanx for all the info guys...i'll remember it all when i go do my exhaust one of these days.

[zfactor]

blue if your gonna do a custom job pm me when you are ready we can do it over here for you. madrel bent stainless and all.