High flow cat help

[indierthanthou]

When you guys put in high flow cats, where do you put the o2 sensor? after one of the cats, or do you put in an x-pipe or something and put the sensor there? OR do you just tie the 2 exhaust pipes together into 1 larger one and run a single exhaust back?

[indierthanthou]

bump

[icesoft]

I used a 2-into-1 collector under the front passenger's feet, and ran it into a single 2.5" high-flow cat. I welded the connection at the cat and drilled through the 2 layers of pipe on the inlet side of the cat to weld the bung in for the O2 (gave me more material to keep from blowing holes in the pipe with the welder). My exhaust is 2.5" stainless from the collector back. Flowmaster collector, Magnaflow cat and muffler, mandrel bends and straight pieces welded together for the rest.

[indierthanthou]

Which engine do you have? how does it sound?

[Sam-Son]

Where do you get a high flow cat?

[icesoft]

Which engine do you have? how does it sound?

M30, it's kinda loud... Sounds pretty sweet though. I'm probably going to change from the standard Magnaflow muffler to either their 'turbo' muffler or a Flowmaster.