DIY 6.5L Turbo, EGR Delete, and Turn up the injection pump fuel, Or if you have experience with a Pop-tester grab one of those and shim your injectors to 2-2200 psi from 1800 stock and you'll see a big increase... some guys even do headers just to wake it up but only 1 guy makes/sells em and they are $880.
Besides manual glows a decent exhaust.
A dual exhaust with straighthro magnaflow mufflers. 2.5 inch pipe.
The systems on a lot of u.s cars are strangled with small single pipes, mufflers with complicated chambers and pipes (cut open the OEM gm one-what a mess).
It will run cooler with more power. With cast headers it appears it doesn't need a lot of silencing on the 6.2. glass packs may do but it depends on your particular taste.....it would take a book to know it well.
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