What is the length of the stock cat from end of flange to end of flange? If your under your Evo with a tape measure, can you help me out? I won't have mine till March, but I've got a test pipe idea. Thanks.
I'll could do it myself and rig the O2 sensor for $30.
I'm looking to use a BR 2.5 DP, test pipe, and full three inch mandrel piping after that. The test pipe will be a 2.5 to 3.0 transitional cone, but it needs to be the same length as the stock cat so it can be swapped in for smog.