Well since imma be boosting in a few months, id figure ill need a new cat. I'll most likely get a Carsound cat but I dunno what size is best for my application? Since im going turbo, Im thinking 3 inch is good? But is that too big? or should I just get a 2.5 inch? I have a Greddy EVO exhaust system btw. I have a 02 Accord 4cyl.

So what size cat should I get? and NO I dont want a test pipe cuz I still need to pass emissions .

 

2.5 or 3 inch Carsound Universal Cat. Just dont get the diameter of the cat bigger than the diameter of your exhaust piping. Bottle necking is a turbos enemy. Check out www.IPSracing.com just in case you haven't found a place to get one yet. They also offer them with ss flanges welded on.