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      05-24-2013, 06:39 AM   #106
New Member

Drives: 07 328i
Join Date: May 2013
Location: East Coast Beach

iTrader: (0)

What is the size on the outlet piping? Might be a noob question but I wonder if two high flow cats can be welded onto these headers. Like take a piece of pipe out and replace with high flow cats. I don't plan on getting a tune anytime soon (my last modified) so I would think the a/f ratio to good. Without those cats and o2 sensors in line, I feel like the ratio will be off. Am I wrong here or no?