[bartbes]

Hey guys,

My car is pure stage 2 plus meth pushing 24 psi and 13* of timing with a gutted oem exhaust. Now the rasp and smell is is getting old so does anybody know if it is ok to reinstall the sec cats, or would they be to restrictive for my setup?

Thanks!

Buy high flow cats = problem solved.

[bartbes]

That would be my next option but the old ones are sitting in my garage so it would save me some $ if it doesnt make any difference

go for it

[Chris@VargasTurboTech]

There are many guys out there with upgraded turbos who keep the secondary's in and do ok. The E90, especially, is not particularly restrictive. I saw about a 10-12 whp difference at the 500 whp level, only way up top in the RPM band. That difference will grow as power increases but it's just not a big deal to leave them in.

Chris

[TemjinX2]

if your over 550whp, i would just get after market high flow cats. Replacing oem cats are kinda expensive.

These guys were running a single turbo setup and blew out there cats while they were dynoing the car.

[German Straight-6]

upgrade your x-pipe to a better quality stainless steel one and add two resonators where your secondary cats used to be. much, much better sound, no rasp and no loss in power from putting the secondaries back.

Originally Posted by German Straight-6

upgrade your x-pipe to a better quality stainless steel one and add two resonators where your secondary cats used to be. much, much better sound, no rasp and no loss in power from putting the secondaries back.

Resonators do nothing about the smell.

Originally Posted by TemjinX2

Replacing oem cats are kinda expensive.

He already has them.

[German Straight-6]

Originally Posted by FCobra94

Resonators do nothing about the smell.

correct, I thought he only mentioned the rasp which is why I mentioned resonators.

why spend money on high flow cats when you can just reuse the sec. cats?

[TemjinX2]

Originally Posted by FCobra94

He already has them.

i'm was inferring that if he used his secondary cats and then it blows out from high boost like the guys in the vid, they would be expensive to replace versus aftermarket high flow cats unless he gets lucky and finds some used oem cats.

[Riceball777]

i have the pure stage 2 DD turbos and i have vrsf catless down pipes and i cut out the secondary cats and replace them with vibrant resonators. The car is still super quiet with no rasp and i dont notice the smell at all

[German Straight-6]

Originally Posted by Riceball777

i have the pure stage 2 DD turbos and i have vrsf catless down pipes and i cut out the secondary cats and replace them with vibrant resonators. The car is still super quiet with no rasp and i dont notice the smell at all

great setup!

do you still have the OEM resonator intact, and what sort of muffler are you running?

[mike@x-ph.com]

Originally Posted by bartbes

Hey guys,

My car is pure stage 2 plus meth pushing 24 psi and 13* of timing with a gutted oem exhaust. Now the rasp and smell is is getting old so does anybody know if it is ok to reinstall the sec cats, or would they be to restrictive for my setup?

Thanks!

install the OEM ones, no problem

[PLF69]

At that price hard to pass, I bought one for my friends turbo miata and works great, even gave a little more sound in the exhaust, perfect.

http://www.ebay.com/itm/3-Catalytic-...9W1nZ5&vxp=mtr

I also have no cats and vibrant resonators on my 135i, altrought I like the sound I might go back to cats some day just to totally eleminate the smell and make the car a little more quiet.

[JuniorB]

Originally Posted by German Straight-6

great setup!

do you still have the OEM resonator intact, and what sort of muffler are you running?

He just showed a pic of two vibrant resonators,

[Riceball777]

Originally Posted by German Straight-6

great setup!

do you still have the OEM resonator intact, and what sort of muffler are you running?

I have an e90 and I run the stock exhaust system with stock mufflers with the stock resonator. I just run Vrsf catless downpipes and I cut out the stock secondary cats and welding in vibrant resonators in their place.

[hughrd1_e90]

I have GC lites fbo e90 xi 6mt here. I have the stock exhaust system with vrsf downpipes. Maybe I could buy the 2 high flow cats shown and remove the resonator and put a x pipe?

[German Straight-6]

Originally Posted by hughrd1_e90

I have GC lites fbo e90 xi 6mt here. I have the stock exhaust system with vrsf downpipes. Maybe I could buy the 2 high flow cats shown and remove the resonator and put a x pipe?

Everything you’ve mentioned is a total waste of money.

You already have secondary cats, why spend the money on high flows?

You have a resonator and a very good one at that, why remove it?

If you have a good resonator, you don’t need an x-pipe. It’s either one or the other so I don’t see a point.

My suggestion if you want more sound? Well you can go one of two routes.

1. If you don’t care about smell, remove your secondaries although I suggest keeping them.

2. Either do PE mod to your current muffler or replace it all together with a resonator going out each side of the bumper. It will sound very good.

[German Straight-6]

Originally Posted by Riceball777

I have an e90 and I run the stock exhaust system with stock mufflers with the stock resonator. I just run Vrsf catless downpipes and I cut out the stock secondary cats and welding in vibrant resonators in their place.

Nice... that is a great setup. Would you kindly post some exhaust clips?

[Riceball777]

Originally Posted by German Straight-6

Nice... that is a great setup. Would you kindly post some exhaust clips?

I never made an exhaust clips but the car is very very quiet. Not much louder than stock.

[German Straight-6]

Originally Posted by Riceball777

I never made an exhaust clips but the car is very very quiet. Not much louder than stock.

There is a difference between good sound and loud sound. Yours falls under the “good” category...