I am very new to the world of exhaust systems. But i have a 2006 Pontiac Grand Prix GXP with the 5.3L V-8 LS4. I am wanting to swap the resonator out with cherry bomb glass packs. I have no idea what size to get how long it needs to be or anything. I have read several forums on here and GPONA.com but all of the posts on it are for the 3800 engine. I dont want to spend 600 bucks on magnaflow compete exhaust kit i just want to make it sound lounder and a little deeper. Any one with the V-8 engine or know anyone who has it and has done glass packs please give me your input.