S14 Cat question !!!

[ZULU]

Hey guys,

I have been thinking about pulling out my cat and just running a straight thru design.

I have an APEXI N1 and this is what i have in mind to put in replacement of my cat.

http://cgi.ebay.com/ebaymotors...=WDVW

My question is ...

1. will my car sound rice without a cat ? 2. will there be a noticable increase in power if I do this mod ? 3. will I get check engine lights coming on without a cat ?

Thanks guys

[hybrid_flyer]

1. no the muffler is what controls the sound not the cat

2. a slight increase

3. YES, and if you are in Ca its a felony punishable with up to a $150,000 fine

[Nameless EJ6]

1. no the muffler is what controls the sound not the cat

2. a slight increase

3. YES, and if you are in Ca its a felony punishable with up to a $150,000 fine

1. Yes actually it does resonate sound. Pull your exhaust off and run the car with the cat and without it... HUGE difference. I run a side drafted exhaust on my 240 with a cat.. if I take it off it's WAY loud for the street. A muffler will help keep it down though.

2. Your OBD2 car will become retarded if it has a secondary 02 sensor in the cat. Shouldn't do it.

3. Run a testpipe with a heatshield on it. No one will know unless they're testing the car with a wideband at a ref station.

[PGBrian]

guess what homeweiner?you know where the cat is on s14?it's in the downpipe location.so, you need to take that piece of **** out by getting hotshot exhaust manifold or something.

[hybrid_flyer]

yeah if you remove the exhaust of corse, but if you remove just the cat, the muffler should muffle enough of the sound where its not that bad. I thought open loop advances timing so its easier to ignite AF mixture

[PGBrian]

for the record.

i have a straight pipe in palce of the dummy cat.i also use stock exhaust.it's quiet. not loud at all.