theboy

Does anyone know what is the Pro and Cons of removing CAT for 4AT?
will it make the car go faster or slower?

llzjayarzll

im pretty sure that it doesnt do anything significant alone, maybe a combination with pullies would help more noticable.

theboy

does it have a side effect or will it make the car go lean? or will it disturb the back pressure? or it will give higher flow rate?

RX8THELAW

nah it should be good but like he said with other mods you'll see bigger gains like exhuast and such

mysql101

you're going to gain maybe 3 hp, and it's going to make your car stink. You're better off just getting the rb reflash or something else that's not illegal.

theboy

oh ic. thanks for the info.

Fanman

Also, large chance you throw up the annoying check engine light.

Ajax

not to mention it'll be loud..

mdw1000

I think the RB reflash is only for the MTs.

I'm trying a new rear end gear soon and will post my seat of the pants results once that happens.

theboy

i know it will be very fast on pickups. it will be amazing. but u will lose your topspeed.
but like all the singapore members say, how often u go 200km/h?
and u also need speed cut for that. hehehe

llzjayarzll

theres an RE flash on asia forums for AT. dont know if its still going on.

theboy

it was in singapore. no more.
i am located at east malaysia, that is north borneo to a lot of u.
can't send my car over, too far, so too bad for me.

09Factor

I removed the stock cat and install the RP hi-flow. I did notice a change. It "seems" to pick up a little quicker. Also the thortle response is faster. Now since I dont have a g-tach or did a dyno, this is all speculation.

No cel yet.

Zero_Rotary

Does it cause the idle to be rough?

09Factor

The idle was rough before the stockcat came off and the hi-flo went on. So I would say no.

Moon Assad

Ive been running the stock cat and exaust for a while. I just put a strait pipe in place and gained 20 HP. Im shure its not as dramatic without FI but its proven the less back pressure the better on power with a rotory.

foo77

^ 20 HP... sound tempting.. did you dynoed it?

Endgame

Yes, has this been dynoed? Why would a straight pipe add that much HP and the Hi Flow cats cannot touch that gain? Am I missing something? I know the cats will not have a 20 HP gain, but I would thing maybe a 10 HP gain. Help me out because if you really got 20 HP and have the dynos to show it (or back it up). WOW!

SlayerRX8

He said the gains were more dramatic because of forced induction. I'm sure he did dyno it since he's working on the 4 port blower at Pettit.