what exhaust setup would be the best for a turbo setup?

 

Take a look at some of the 4" duramax catback setups. I'm sure one of those kits could be tailored to a custom turbo kit downpipe.

 

Best would be a downpipe that dumps out from under the front bumper cover in front of the tire. Practical...something of the 4" variety all the way back with some carsound cats.

 

what would be the best type of muffler to have

 

On this page, bottom section:
http://magnaflow.com/02product/universal/round.htm

 

Remember that a turbo acts like kind of a muffler so you may not need one. I am gonna try to run without one with my STS setup and see how it works. Although I'll still have stock exhaust for most of the way back it will be different in my case.

 

I know its a little different, but the Neon SRT4 has no muffler, only a cat. It has a little rumble to it, but its not loud by any means.

 

Exhaust systems on a Race turbo system should take a minimalist approach for track power. Realistically if you still need to drive it on the street you going to need some acoustic attenuation and peak flow alone should not be your only consideration. The horsepower levels you are trying to achieve will dictate your best diameter and more over the compressor map (turbo's effieciency) will also play a role in which exhaust tube diameter will net you the most drivable conditions (quicker spooling.) A little backpressure will sacrifice a little top end power but will get you in to boost faster. I will warn you a 4" gas turbo system will be less than tollerable on the street from a noise level poit of view. From a performance standpoint you can look at supporting 600+ rwhp in a single exit 4" downpipe back type system. Diesel Hp numbers are not exactly directly corelated to gas HP as the amount of exhasut and exhaust pressure at any given boost level is not the same given the dramatic differences in power production means @ the same HP.

I've got a tremendous amount of data regarding flow characteristics, volumes, and capacities of muffler designs and tube selections some of which are proprietary but most of which I can share principles which are general enough for you to make a decision.

 

The SRT4 actually has a fairly large cat and two inline resonators and good degree of design implemented in the number of bends and tube size to achieve the numbers they needed. I will say that DC (Daimler/Chrysler- not to be confused with the aftermarket company) did put some time into getting this car to squeek by tier 1 vehicle noise compliance standards.

 

After that post, i feel pretty dumb. Lots of big words. j/k