I figure my hp is down to around 100 anyway. This engine is far from new. What was the stock diameter anyway? Mine appears to be stock and it's 2"
One good reason to go with wider exhaust is to change the tone. Wider exhaust helps drop the pitch or at least reinforces the lower harmonics. There is a limit to this as well. The pitch is dependant on rpm. I love the way my Dad's Chevy truck sounds with 3" pipes (350 sbc).
