my day at the dyno!!!!!

[thermal]

Remove the cat or get a high flow cat from random-tech. Kteller at Honda-Tech also sells pre-fab 3 inch piping for civics. You will have to get a muffler tho. I've seen these systems. Pretty nice. most people use the N1 style muffler.

All I have is a modified downpipe. I cut that tiny ass GReddy DP and made me a 2.5 inch instead. No cat. I ran a 2.5 inch pipe all the way and a thermal R&D muffler. I havent dynoed my civic since.

Thermal R&D 3 inch is the way to go tho. I bought mine from Hondaman-iac brand new..... for my Teg. He hooked me up. Just a reminder to everyone, the pipe will not bolt directly to your stock cat. you'll have to get either a test pipe or modify the cat. In my case, I have no cat. I made my own test pipe.....