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I just noticed, who tuned your car? I have the exact same setup as you and I really want to get 400rwhp out of it. Right now I'm at 385rwhp, 381rwtq with a tune. I kinda figured there was more in it.
These are my mods, maybe you have something I don't??
03 LS6 Z06 motor, fast 90mm intake, nick williams 90mm TB, off-road y-pipe, SLP loudmouth 2 cat-back, MSD wires, ram powergrip clutch, ram slave/master, EGR + emissions delete, AC delete, custom tune.
I know the 90mm setup is probably hurting a bit on the low end without a cam but I didn't think it'd cut 15hp and 10tq off the car.
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