My exaust system is about rusted out on my pickup. Its a 350 a4. I was going to buy me a set of headers and some bullits and wondered what is it going to take to get rid of the cat and still run correctly. A/f speaking.

 

If you use long tubes you will need to get a 3 wire O2 sensor and wire up a switch on for the heater and ground on the other wire. You need a heated sensor due to it being further down the exhaust line and not warming up enough. You can get shorties that have the O2 bungs in them already.