Klutch had a Megan 4-1 header, magnaflow hi-flow cat, and an HKS Hi-Power axle-back, with custom piping to be exact. Also on YouTube, his username is dklutchb. He does have a few good exhaust videos on thereKlutchDB7 had Megan 4-1 headers on it which gives it a Subaru sound. I also would buy hks high power exhaust, or if your on a budget, get the srs caback from eBay. I heard good reviews on them.
Look up klutchdb7 on youtube.