After seeing your in-car video, all I have to say is WOW! Maybe I shouldn't mod my GT further and just wait until I can get my hands on a used GXP. I really miss the manual, and the LS3 just sounds better. A 358RWHP baseline also helps justify a GXP purchase. That's about 55-60 RWHP better than a GT, and probably works out closer to 425-430 HP than 415 at the crank.

When you took off the stock mid-section, I know someone (maybe you) mentioned the 2 small resonators from the GT are not on the GXP. What about the mid-muffler?