05' Lincoln LSE. I NEED INFO ON EXHAUST BADLY!!

I was looking for an exhaust system. I would really want a cat-back but they're costly.. should I just get mufflers and attach to the stock piping?... also im worried about the sound. Its a luxury car with a performance heart, but i wanna keep it as luxury as possible. I was looking for an exhaust that is good performance-wise, BUT when Im at idle i want to hear as least as possiple, but i really wanna hear it when I get on it. does anyone know of a system that can offer me that?..... and i guess i wouldnt mind used if anyone is selling.. also it would really help if some one knew the size muffler i would need i if i didn't get the cat- back... sorry its so many questions, but i would really appreciate a few responces..... Thanks Guys

Magnaflow and Dynomax Ultra-Flo both offer top-shelf performance with minimal cruise and idle noise. At WOT, they sound quite nice. At cruise, they can't be heard.

Stay away from Flowmaster and the Dynomax Turbo mufflers, they are meant to be louder.