I had a flowmaster on my 03 Hemi Truck and that was too loud also. I switched to dynamax. I'm currently in Nashville and I got a chance to drive a Critterman's with a magnaflow and listen to a Kappasphere on Solli4me's and Exhaust depot. Solli4me's and Critterman's sounded the same. As for the performance, I can't give you any info on that.