I guess I'm the odd man out because on my previous 05...I straight-piped it and hated it. So on this one...I will stay with factory exhaust for a long time probably.

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2005 Stone White KJ Limited CRD 4x4
Off-Road Pkg
Trac-Lok
Emu 790s/948s
Skyjacker H7088s rear/Bilsteins front
15x7 Black Rock Lobos/31x10.50 Firestones
GDE HOT Tune + TCM Tune
Euro TC
CB radio
Thrush Turbo muffler
AEM DryFlow filter

Hard to describe the exhaust pipe flanges but I'll try: discrete rumble at idle, very clearly hear the turbo whine on acceleration. I haven't heard it from outside the car when it is being driven.
I'll try to find a way to do a sound clip, might stick the video camera out the back and blip it a few times, then put it on photobucket.

This is very helpful information before modifying my exhaust. However, I have one question for all of you...

There's a flexible piece of exhaust before the transmission crossmember. My eyes might be deceiving me but it sure looks like it reduces in size. Is anyone else seeing the same thing?

Thanks for all the help!

My guess is that is there for two reasons. 1 is to make it so the exhaust doesnt have to be perfectly aligned and 2 is so that the engine can move and not put stress on things like the turbo. THey do the same thing on the subarus except it is on the manifold instead of the exhaust. No clue if it reduces though.

I also wanted to add to the point made like 2 years ago about exhaust size/backpressure:

My example is on the Chevy LS motors. You DON'T run headers with 1-7/8" primaries until you are either running a big cube NA motor or a supercharger, basically big hp that the stock LS can't achieve on it's own. In all other situations the car makes more power with 1-3/4" headers. If you don't have the exhaust volume or velocity to make the flow turbulent in the headers, you don't step it up to the next size because you would lose flow velocity. Having the same volume of air with a higher velocity helps pull in the next air charge and increases the volumetric efficiency. You also never see exhausts over 3" on any of those motors whether it is a stock 350 or a blown 427. Bigger is not better, matching the tubing size to your flow volume is key. I assume the 2.5" exhaust on a 454 was simply two small and restrictive and anything would have been better.

I am not sure how much of this carries over to turbo'd cars but in that situation I had always heard the least resistance post turbo is best.

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2006 CRD - GTB2056 turbo by Dieselguy86, Eco Trans Tune, Lift Pump, Week's, HDS Tstat, Racor Filter, ARP's, OME 790's+Top Plate, JBA 2.5", JBA UCA, Moab's+265/75R16, ARB Bull Bar, 4.10's, TrueTracs