I got bored yesterday and took the resonator off my exhuast. As of right now it is just dumping straight out the cat. I was curious if any one sees a problem with just putting a straight pipe in its place. The muffler has already been removed. I have read tons of opinions on backpressure on here. I dont wanna loose the whistle of the turbo though. Should i just get a cat back exhuast? Anyone know of a cheap cat back system?

 

got my magnaflow cat back online 6 or 7 months ago for 287 on sale. might get lucky, but they usually run around 330 to 350ish. don't get much more than some extra whistle, with the muffler installed. probably would get a little more if i took it off. but get back in a stocker and you notice the dif...

 

Why do all that work and keep the cat?
Nothing but pipe from the turbo back baby!

 

Yeah straight from turbo to tip! No backpressure worries!!! That turbo would be the happiest with NO exhaust!!!!!

 

Diesel engines don't need backpressure like a gasser. Straight pipe it all the way.

 

I figured backpressure wasnt needed. But the last time i was at the dealer and they replaced the turbo because they said it was bad they said my lack of a muffler was a problem.

 

4" straight pipe from turbo back.. MBRP makes a nice SS kit..

And with my truck being an 03.. for some reason.. i have 2 other buddies w/ the same setup on '03's and we all agree mine is the loudest when it comes to the whistle its crazy loud

 

they either didnt know what the hell they were talking about or were filling you full of BS.

 

I'm running straight open pipe on my 03. It SCREAMS!! it's awesome and the trucks happy. Don't forget to let the air IN. Straight pipe out means the air can move faster thru the engine. make sure it can breathe.

 

Not sure just what you might be suggesting here, but the stock filter is plenty sufficient and flows enough air up to @500HP- K&N= no good, been there done that, went back to stock. Be careful what kind of intake you might be thinking about, as some are OK and some are not.

 

did you actually have an issue due to K&N? if so what? just curious here...

 

as you can see in my sig. my exhaust turbo back it dose have a flow though mufflerand all it dose is mellow the engin sound.

 

not to fling poo but a gasser doesn't need backpressure either. the reason you need ideal exhaust size for a n/a engine is to create exhaust velocity and to create a scavenging effect helping draw exhaust gasses out of the cylinders via exhaust pulses. to small of an exhaust and the engine is restricted, too large of an exhaust and the engine has to work that much harder pushing a greater volume of air out the tail pipe. turbo'd engines can get away with large exhausts because they are not effected that much by a huge pipe because the intake is under positive pressure forcing air into the cyclinders and doesn't rely on exhaust velocity and pulses to draw the gasses out. i know its not related to the original question...but is related none the less.

 

When I bought the truck-used- it had a K&N on it, and it was a very light pink color like it hadn't been oiled in awhile. So I got the filter kit, cleaned and oiled it, and in about a week I had the hood open and noticed the filter looked dry again. I think I was getting ready to do the CCV reroute and had the intake tube off, the inside was slimy and sticky. Obviously the oil was getting sucked out of the filter into the turbo. I can't imagine that's good for it. Also according to posts on here the K&N allows too many fine particulates past it and THAT is definately not good for the turbo. There are other open-type filters that are OK, I think the AFE has a good one, but I couldn't justify spending over $400 for a cold air intake when the stocker is supposed to be plenty sufficient. I bought a used stocker on ebay for like $60 with a new filter in it. HTH- Tim

 

i have a 4 in turbo back w/ high performance muffler and it whistles like a jet engine dude! it sounds amazing. my bro has the same thing done as me and his actually whistles louder