For all you cat owners...

[supraman7mgte]

Is there a difference in the primary cat and the secondary? I have a Lipp turbo elbow,and it's a full 3 inches,and the OG cat inlet is smaller.I have ordered the Lipp 3 inch flange,and plan on using a 3 inch cat.Custom!!:biglaugh:

 

[Yellow 13]

I believe the first cat is primarily for cold start emissions.