raywong

Just installed a RSR cat del on my E7 today. can't feel the change yet, but the first thing I noticed is the strong exhaust smell. I never before smell anything inside the car with window rolled down, but now I can really smell it.
Is the cat really that amazingly efficient or is there a leak somewhere?

Guru_Del

iTrader: (5)

sounds about right. everyone i have heard with a cat delete you can definitly smell the difference (especially if you remove the cat in your header or downpipe depending on which car you have).

raywong

perhaps the test pipe cause the a/f to become richer? It smell pretty rich now.

raywong

please pardon my ignorance, is a cat del = test pipe?

alleggerita

Yes, there definitely is a difference in exhaust smell w/ and w/out cat. If you live in an urban area and drive your car regularly put a cat in, even though it will make a significant difference in power and torque.

raywong

Is Hong Kong counted as an urban area? I do drive the car everyday, but if the cat is choking my car I am not putting it back in. you can't make me...

RonV

If you remove your, your are going to get that strong gas smell. I used to drive my mustang around sans cat. My hair would smell like gas after a short trip with the wimdows down. If you remove the cat from any car, it's going to smell rich. It does not mean that it is running rich. All of the gas that was being burned up in the converter is now dumping out of your exhaust.

raywong

just came back from test run, this is my finding:

It smells bad.
It is quieter than I expected, just more bass hum.
I feel a slight power lost below 3000rpm.
There is a gain after 3000rpm, not sure how much yet.
The peak boost went up just slightly.

Guru_Del

iTrader: (5)

low end power is lost due to the reduction of backpressure in non-turbo cars. I am assuming you do not have a turbo but i could be wong (sorry i had to make a joke about the last name).

raywong

you are wong! I have a Evo7, and it is so very turbo!

Guru_Del

iTrader: (5)

hmm then there shouldnt be much drop off. might it be percieved? Either way the answer is yes you can smell a cat delete and it isnt all that nice for the environment

enjoy and i am jealous you have the car of my dreams

EvoJimbo

iTrader: (6)

Ray you will feel a lil laggy prior to the turbo boostin. Its the result from increase flow of exhaust and lack of backpressure. But its a good sacrifice, cause the turbo kicks alot harder now. Seems normal that you have increase in boost or a lil spiking.

mitsuorder

iTrader: (106)

yep get used to the stink and if you have an angled exit exhaust get used to having to clean exhaust residue from bumper once a week as well, hey guys in austin look what this guy "teh hUFfy" n TexasRacingScene.com with an Audi A4 1.8T Quattro has for a plate, time for some A4 hunting....

http://www.bullittzero.com/TRS3/show...272#post406272