are you sure these are high quality replicas? the sound's gonna be dependent on the internal muffler design, I'm not saying the replicas aren't high quality, never tried them, but you mentioned you don't want it to sound shitty, usually cheap knockoff muffler = shitty... just my 2 cents, I believe you can buy REAL HKS, Apexi mufflers for less than $200 maybe?