JTelesone

iTrader: (13)

I went from tsp true duals to a hooker catback, and slp cats. My car was tuned with the td's and I know cats lean out the car a bit, how important is a retune at this point?

Starz T/A 17

iTrader: (6)

I really wouldnt worry about it, the main reason people do TD's is for the sounds IMO, from all the dyno sheets ive seen TD's flow just as well as a good catback

JTelesone

iTrader: (13)

thanks, but im not so much worried about the exhaust as I am the cats, anyone know how much it leans the car out

406malibu

after headers and ORY my car runs rich, but its not something thats going to kill your car, just your gas mileage LOL. not sure the lack of cats caused it to be rich, or if it was just the LT's.

JTelesone

iTrader: (13)

what Im saying is my car was tuned to a good AR with the td's w/o cats (12.5). The addition of cats will lean it out a tad right? If so, now that I have cats Im worried about it running to lean. Just how much leaner will it run? unsafe?

LS1nut377

iTrader: (16)

i wouldnt think it leaned out that much.i wouldnt retune until you got somthing along the lines of an intake or heads and cam.

99345hp

if it does lean it out a little bit i wouldn't worry about it. I would think the computer would take care of it. If you have a way to scan, look at your fuel trims and you will see what the computer is doing.

01ssreda4

iTrader: (96)

i agree

JTelesone

iTrader: (13)

thanks guys, sounds liked a good idea.