the engine is a 400 ram air. i have 4 tube hedman headers on it. it has the x-pipe from the exhaust kit i got not to long ago that i want to keep. by the way never buy exhaust systems from Pypes, they sound bad. i'm thinking of the flowmaster super 44 mufflers or the flowmaster 50 series. i also am thinking about magnaflow but i don't know which to get. i want a raw aggressive sound both in idle and accelerating.