One week until my new motor will be ready just setting up the final parts. I'm building a street/ road racing car. I'm going with a all new all different setup. All that is left for me to get is the headers, new x pipe, cat-back exhaust, and clutch. Now i think I'm going to go with the bbk ceramic headers(not a 100% yet) as well as a bbk x pipe. Again nothing is ordered just putting a brand to a price so to say. My question is what cat back system would be the best sound/performance. I have flowmasters now not really a fan, i have ran borla exhaust years ago but since have forgotten the sound. Bottom line is I haven't spared any expense on the motor and do not want a high dollar motor sounding like low dollar crap. Also I'm going to need a new clutch something that can support hard use at around 450rwhp suggestions??Thank you for any future advice given it is very much appreciated..