i was just wondering if there is benefits or dissadvantages when going with either a 2.5" DP or a 3" DP. my friend keeps tellin me to get the 3" but i seem to only find the 2.5s everywhere, or 2.5 flared to 3. is there any difference? what should i go with?

 

2.5 : It will clear a lot more ****, its more common, its good enough for a lot of turbo set-ups out there.

3: Most likely a 3'' down pipe won't clear a/c and p/s. It provides more flow for the higher powered turbo set-ups, less common.