I am making alot of changes to the truck right now and exhaust is one of them. I did some porting on a set of 243's i had laying around and milled them .010, also using some .040 cometics. I made the heads look as close as i could to a set of Patriot stg.2 LS6's i took some pics of.
I also have the 228R-112, Fast 90 mildly ported/LS2 TB, Underdrive Pulley, CAI, Pacesetter LT's

My exhaust at the moment consists of just comming off the headers (3" collector) with a 2.5" SBC collector reducer, back into a 2.5" dual in/dual out Magnaflow with built in X and regency tips welded to the muffler. Im thinking of going with 3" duals with x-pipe into the same muffler/tips combo!
Using this x-pipe kit
http://store.summitracing.com/partde...5&autoview=sku

 

3" duals is too big. Dual 2.5" max.

 

Single 4" would sound sick on your truck.

I don't think dual 3" would be way to big for your truck, since it is a 5.7 H/C

You might lose some low end. Have you looked into adding cutouts instead?

 

he'll be north of 400 rwhp. I'd go with dual 3" myself. He's rcsb so he's lighter too.

 

im running the same x-pipe.. i have the headmen tqSteps into dual 3" w/x-pipe to super40 flows.. seems to run pretty good and has good low end response and sounds good to.still have to cut those hangers off.. me and a buddy built the exhaust at my house...

 

so are you running the 3" kit??

 

do you know where in might find some video clips of a 4" exhaust

 

Look on tech....some guys over there run a 4'' mufflex systems and they sound killer! Im running true dual 3" on mine!

 

Theres a few guys running the stock 4" diesel exhaust on their turbo trucks. I'm sure one of them has a sound clip.

 

stock diesel isn't quiet 4 inches I believe it is 3 1/2