Looks like I need a cat, aftermarket recommendations

[gmcman]

I plan on getting an exhaust pressure test this week but the downstream O2 sensor is all over the place and the outlet temp is about 100 deg below the inlet. Been concerned about a 1-2 MPG drop on the DIC when I'm steady cruising, flat road @ 60-65 and I'm getting 19-20 MPG when I normally would see 22 ish. Could be slightly clogged as well and I have no codes and just recently changed the original upstream sensor which is likely a culprit to the ill-health of the cat.

I personally like Magnaflow, just would like opinions if anyone has used others, direct-fit specifically.

 

[Menthol]

I plan on getting an exhaust pressure test this week but the downstream O2 sensor is all over the place and the outlet temp is about 100 deg below the inlet. Been concerned about a 1-2 MPG drop on the DIC when I'm steady cruising, flat road @ 60-65 and I'm getting 19-20 MPG when I normally would see 22 ish. Could be slightly clogged as well and I have no codes and just recently changed the original upstream sensor which is likely a culprit to the ill-health of the cat.

I personally like Magnaflow, just would like opinions if anyone has used others, direct-fit specifically.

Be contented, I have to time traffic lights and use hills to get 14MPG with the EXT Have to upstream sensor but have to take it to a shop to get it changed, it wouldn't budge.

 

[gmcman]

Well I took it for a drive tonight and after a few miles I started watching the live data and the downstream sensor stayed between .51 and .58 volts.....

Maybe it's ok so I will check the backpressure to confirm, just odd that the temp leaving the cat was a lot lower than what was going it.