05 V8 mods

Does anyone know of any available performance mods for the 05 tb ext v8? I know the short tb's with the 4.2 have stuff and the old V8 had some things, but the 05 is a Gen IV v8 with DOD. I'd like dual exhaust, as the engine has true dual exhaust, but combines them to one.

For exhaust, you have to go custom. There are no kits from Borla/Bassani/etc. that will fit any EXT period. They only make exhausts for SWB TB/Envoys, and I dont think the DOD would have any affect on the exhaust, except maybe the headers would be in a slightly different place. I know K&N makes an intake that is universal to 5.3L V8s, regardless of DOD. Westers Garage makes a tune for it now, look at http://www.trailvoy.com for the threads and more info and feedback on the mods I just mentioned.