Does Magnaflow or any other exhaust supplier offer a downpipe/hi-flow cat combo similar to the ones for the 3800?...or did GM actually get wise and put a good flowing pipe and cat on the LS4 to begin with?

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2004 Bonneville SLE "Bonnie the Ghosthawk"
2001 GP GT coupe (now my sons)
GPONA Mopar owners club
2008 Chrysler Sebring convertible

The u-bend on our cars isnt as bad as the 3800's, and the cats are average. Hogan performance makes catted and straight pipes for the LS4's, and seem to bee good quality.

The LS4 have a high flow cat from the factory, no U-bend really to speak off, So they did alot better job than the old 3.8's

The most restrictive thing on the LS4 exhaust, is the cross over. I have talked with Hogan a couple of times about making one of these for our cars, but not sure if he has found a donor car to make one or not. I can't afford to go without my car for a day or two, or I would just drop it off at his shop.

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2007 GXP w/ minor mods

Has everyone who put on the down pipe had the code show up and if so is it hard to get rid of

Only reason I have a code is because I'm running catless, all you have to do is have somebody with a tuner tune out the second O2 sensor, I believe.