Hi my question is when i remove the cat. converter and weld in a straight pipe would i have to use 3 wire 02 sensor or will just a new 1 wire work?And as for the sound level how much will it increase if i just removed the cat and leave everything stock regarding the exhaust?

Thank you wery much

Uljas

PS sorry for my bad English i am Estonian

i got no cat and a one wire O2, runs fine, a 3 wire is more accurate people say i got a flow 80 and its loud

got a freind with a Z28 that has no cant and stock early style dual Z28 mufflers and its real mellow, just loud enough but not to loud

The stock 1 wire sensor will work fine. The O2 sensor doesn't care what happens after it.

When I removed my cat it really didn't make that much of a difference at idle, but at WOT it made a huge difference. Then again I did add headers at the same time and already have a flowmaster 80 series.