i found a place to make a cat back system,
he told me he would make it out of 3in mandrel bent tubing
with bigger them stock resnator and larger then stock 3in magna flow stainless steel xl mufflers and modding stock tips ,my request
he said the 3in will work perfect with larger resnator and mufflers to keep it very stock sound with a little deeper growl and more power all the way around
i trust him cause he did the system by hand for my saleen due to how low it is,
very good work
he wants 690.00 installed, i think that sounds good
what do you guys think????

please only real coments,thanks

 

if u could get a dyno done afterwards then post it that be great and much appreciated

 

Honestly I think you are going to lose a lot on teh bottom end for a small gain on the top end. The engine size just isn't big enough to require 3" piping. I personally would stick with 2.5-2.75" max.

 

Sounds good to me, the pipe diameter is not going to make that much of a difference but the muffler swaps will help a lot.

 

3" all the way back...i think that might be pushing it. are you looking at a SS system(both the exhaust pipe and the mufflers) ? if not then I think 690 is a bit high, if its stainless steel then thats a pretty good price for it all, actually thats going to be hard for other shops to compete with.

 

i forgot to say,its three inch to the y pipe,then its 2.25 inch,
this is how i look at it,my mustang can with stock true dual system and its same hp as my tl before i supercharged it,mustang that is.
i sure the car can help from it,
and the bigger piping will work better with over sized resnator and mufflers

 

What kind of Saleen do you have, anyways what your doing is what I might do instead of Comptech........

 

i wouldnt go 3" before the split...you're just spending more money on the parts. i dont think you are going to get the gains you are looking for...i kept the oem pipes because they seemed big enough and just swapped the mufflers to the magnaflows because they are less restrictive. the comptech is too much money for something you can do for a lot less.

 

Oh yeah, bigger is better

 

Something that Acura did with the TL was to reduce pipe size in steps from engine to tailpipe. I believe this is done to maintain exhaust velocity as the exhaust cools. Following this strategy in a custom system seems like a logical approach to reducing restriction while attempting to retain efficiency. The smaller pipe and muffler sizes would also reduce cost and weight. Use whatever size tip is preferred for aesthetics, but no need to run larger pipes than needed.

 

my saleen is a mustang conv 2001 and they scrape every where,
i understand what my guy means,the three inch is to make up for how large the resnator is and the extra back pressure and same with the larger mufflers,
i want it that way cause i want no sound louder then stock,not by much,,
i know comptech system drones under load,i dont want that,i have a loud ass car,dont need two.please under stand i want it very quiet and any mufflers that are free flowing are louder.i hate rasp from small motors too.
this with my k&n will help to be more free flowing.
also think of this,how many cars do you know of making 270= hp that have stock 2.25 system under it ,not many,
cars in this hp range use true dual systems
or high hp 4 cyl use 3 in too,
3 in is not to big when used right,its only going to be from the thrid cat to the y pipe,then 2.25 to mufflers,

 

Sounds good, how about you push it to $650? and thank God this is in the LA area.

 

you know something about exhausts??

the idea is to keep the gases as hot as possible until they exit the mufflers.

a good 2.25" system is good for about 400hp on a normally aspirated motor, after that the pipes become restrictive so 2.5" would then be used.

 

I'm still trying to understand the exact logic for using the 3" pipe. I believe that is too big and in many many many past experiences have seen that going that big will yield no better results than keeping the oem system on there. Is the resonator you are using with the 3" exhaust restrictive? Are you planning on using more than one resonator and feel that the larger pipe will help compensate for that? If you dont want the system to be loud BUT want to use 3" my guess is that you are going to have to use a 24" resonator, at least. Magnaflow is going to drone under load as well...mine does, thats something you are going to have to deal with. If there was a way to get rid of it without sacraficing the new exhaust note, I would have already done that.

 

acura101west let us kno if theres a diffrece and a sound clip would be nice thats if u get it done

 

by the way can u change anythin b4 the third cat and if u can by changing it would there be any gains

 

i dont think there would be much of a gain unless you removed the cat itself (i dont rec. doing that) The downpipe/headpipe seems like a pain in the ass to make and I really dont think you have much room to up the diameter of it. Its best to just leave the 3rd cat alone b/c any gains that would results will be minimal.