View Single Post
      11-24-2012, 02:26 PM   #8

Drives: E90 N52 AT
Join Date: Apr 2011
Location: Vancouver, BC

Posts: 2,681
iTrader: (4)

Originally Posted by Amini77 View Post
Release like 15hp, the only downside is how loud catless headers are and you won't pass smog
I created a custom cat less manifold/headers and the sound barely increased. Also you will only fail emissions test if they use a sniffer or visually check for primary cats. Using the the BMS downpipe fix in conjunction with headers will pass if tested on an obd check.

Last edited by mapleridge; 11-24-2012 at 06:03 PM.