I need to know the diameter of the exhaust piping so I can order new cats for it, I'm throwing a p0430 code, and I have already replaced the o2's, plugs, and wires. For some reason, I thought they were 2.25". Correct me if I'm wrong, but I need to get this fixed, my gas mileage is HORRID because of this!

 

if its for the TA it should be 2.25" pipe. might wanna check ls1tech

 

Shoot, thanks Jake, I actually need it for my 02 Z71 Tahoe. I'm not running cats on the TA. Thanks bud.

 

if its bolting to stock pipe im not sure if its 2.25 or not, if it is just order 2.25 inlet and outlet cats, the exhaust shop will expand the ends so they can weld on it anyway.

 

stock cat size is 2.5" I believe for the tahoe