ebk06

iTrader: (5)

Im putting an LS1 from and o4 GTO onto my 91 mustang. Unfortunately I wont be able to get just and OBDII test since my car is older it will still require a sniffer test. So I need to know what the best cats are to pass this. Ill be making two different x pipes, one for testing and one for the other 364 days of the year so Im not worried about losing performance with this.

The car has longtubes, 228r cam, cold air intake, and will be tuned once its finished up. I'd prefer to not have to go to my tuner twice a year to tune for a cleaner running engine.

Any suggestions or preferably first hand knowledge?

99Bluz28

iTrader: (35)

Are you looking for 2.5" in/out, or 3" in/out ?

Round or oval, long or short?

ebk06

iTrader: (5)

2.5" in/out and shorts would be better. Not sure if long or oval would work best? Probably doesnt matter since they will only be on the car for a few hours and wont see any real road time.

Thanks for the pm.

*02WS6TURK*

iTrader: (13)

I've always had good luck with Magnaflow

salemetro

iTrader: (5)

Random Technology. Weird name, EXCELLENT catalytic converters.

01ssreda4

iTrader: (96)

Standard duty Magnaflow cat will pass with flying colors.