afed24

I have a 2001 camaro ss with few bolt ons, intake, exhaust. I have long tube headers with high flow cats waiting to be put on but cant quite decide what to do. Would it be better to run the cats so i can get more back pressure to help my low end or if i gut them would it be better without the back pressure or would i not necissarily need the back pressure? My longtubes are 1 3/4". Please let me know, thanks.

RevGTO

iTrader: (12)

There's no substance to the back pressure = low end torque myth. Better flow equals more power, period. The reasons to run cats are exhaust smell and to soften and mellow the exhaust tone - cutting down rasp.

roninsonic

iTrader: (3)

the whole backpressure thing is a misunderstanding that relates to primary size (oversized primaries kill exhaust velocity and hurt power down low)

Get rid of those cats if you're lucky like me and don't have a state inspection or emissions

RPM WS6

iTrader: (3)

Cats do absolutely nothing to increase power; they can only hurt (just how much they hurt depends on the overall setup). They are strictly an emissions device that are not needed if you don't have to take a sniffer test.

afed24

okay nice thanks guys. I'll be going without cats, and am not worried about emissions here in NY I got ways around it

BWZ_2k2Z28

BINGO. If you care and have time you can search the back pressure myths on this site. Its a lot of info about it.

afed24

yes i will definitely look, its good stuff to know never enough info on these cars haha thanks

MrBluGruv

If your engine needs restriction to make power, it's time for a different cam.

ajzcamaro

iTrader: (2)

Get rid of the cat and enjoy.

sscamaroburn02

iTrader: (14)

If u want it loud and little smell of gas then time to remove them. My exhaust tone sounded so much better after removing the cats

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nascarnate326

iTrader: (1)

Depending on the application I would go with high flow cats. Maybe I am getting older but the gas smell is getting old.

RPM WS6

iTrader: (3)

Today's drivers and most of the younger crowd in general just aren't used to it. All cars used to smell like this, especially those with a high performance cam. It has never bothered me.

Sinister_Z28

Im young lol but i like the no cat smell. It smells like power.

N2Ojunky

This is good to know. So the cats are not needed. If they are removed will it throw the check engine light and if it does will it affect the power?

89gtcs

It will throw a check engine light.

RPM WS6

iTrader: (3)

Tuning or O2 sims can take care of the light (yes, there will be one). The light will not affect power.

Truck10

It all depends on the tune.

Holloway5

You can order oxygen simulators and it will stop from throwing the code. I have mine tuned out

Fotis

iTrader: (2)

punch out ur high flow cats and tune out your cats, rear o2 and your EGR... u don't need any of that... but if you need to pass emissions u'll need something to pass the visual inspection thats why i said punch them out.

SS SLP2

iTrader: (8)

If true high flow, you should see rite threw them, if so nothing to punch out , and no problem with rear o2s, may / may not require re tune ( should not need ) I retune quite often anyway
just my $ 0.02s Johnny