LVSTOGOFST2002

iTrader: (3)

my truck is too damn quiet. i want to install o2 simulators and remove my cats. will this affect the way it runs? i.e. computer issues?

F8L Z71

I recomend doing a search in here for the best info.

That being said your best gains will come from removing them and doing a custom tune. You'll need to fix your LTrims to correct for gas milage and max power and turn off COTs.

sfj

careful a lot of people have removed the cats and lost power in lightly modded trucks you might do a search on that too just trying to help out

F8L Z71

I would wager money to say it's because they didn't tune for it.

Without tuning it's a 50/50 shot IMO wether you lose or gain power. All depends on your trucks current tune.

Texas Terminator

leave your cats alone, it won't make it much louder. spend the money on a different muffler instead. between the tuning you will have to do and the cost of taking them out, you could do true duals.

02chevyracing

iTrader: (1)

i gutted my cats got the simms and have true duel 1 chamber flows dumped at the bumper it sounds pretty good i didnt notice any less horse or torque loss. but it is quiet in the cab and loud at the rear. I LOVE IT!!

wannagofast

I would like to do the same thing with mine. I have heard that some of these engines run off of back pressure. As far as I have allways heard to back o2s dont realy do any thing just the front 2 that do, tells the computer to run richer or leaner. I keep getting a P1153 code on mine witch is something to do with changing from rich to lean and lean to rich. Also what about headers? Made mine a little louder. Guess its just like F8L said 50/50!

99Silver6.0

iTrader: (1)

Rear O2's are for cat efficiency and COT as far as I know. From what I have seen at shops with LS1's on the dyno, they tend to make more HP with little to no backpressure. Unless the 5.3's are really really different internal wise I dont think it would hurt ya. Im gonna cut mine off and turn off the rear O2's with Edit. Then have it tuned and I guess Ill see what happens. On another note, take the cat completely off. Dont just run a rod through it and clean the catalyst out. That creates a good amount of turbulence in the body of the cat.