User blog comment:Brick425/The Impala SS/@comment-5111283-20160321011951/@comment-5111283-20160321014126

You need headers (can be had used for $100), and swap out the cat for a nice resonator (can be had for $35) - it will sound pretty decent for a V6. :P That's what my GTP had. A DIY CAI for $40 isn't bad either. :P Get a nice canned tune from one of the forum guys for $50-$100, TransGo shift kit from Amazon for $40 (http://www.amazon.com/gp/product/B008XO9ATC?keywords=grand%20prix%20trans%20go%20shift%20kit&qid=1458524442&ref_=sr_1_fkmr0_1&sr=8-1-fkmr0). :P So, for about $300... :P