The Maganflow cat arrived at my house today, I'll get it installed sometime this month. This piece completes the exhaust system on my GSR. 2" Greddy header>2.25" cat>2.36" ExMag. The only other bolt-on is a CTR intake cam. I'm aiming for tuning in February(tax refund time), and shooting for 160whp on my mild NA setup. I'm considering the ITR/CTR exaust cam as well before tuning. All comments and suggestions are welcome.