de-cat - Hyundai Performance Forums

sunny83 · 02-05-2003, 08:10 PM

will i se an real power gains from removing the catalitic converter i stay in the uk so can get away with emmissions

Mach5 · 02-05-2003, 08:18 PM

dweet · 02-05-2003, 09:57 PM

like .000005 hp :gasmask:

Alacritan · 02-06-2003, 01:09 AM

Cut out the resonator and it'll sound more aggressive, though you still won't see anything in terms of performance.

nyne · 02-06-2003, 06:50 AM

4 cylinders need 'some' back pressure, and running near stock n/a, aren't making enough power to pull much power out of removing the cat. just get a catback exhaust, and a high flow cat if you're really into that whole idea....

sunny83 · 02-06-2003, 08:16 PM

do the rest of you all use high flow cats

beppomarx · 02-06-2003, 09:26 PM

if u want more performance and you already have a cat-back or headers then yes use a hi-flo 2.5" cat. removing it will make your car smell like rotten eggs. and its not a faint odor either its pretty annoying. and maybe maybe maybe a .5hp gain.

AccentMangaGL · 02-06-2003, 11:31 PM

There's the backpressure again....why does everyone feel the need to say 4 cylinders NEED back pressure....no cars NEED backpressure. Backpressure is something you try to avoid. Secondly, yes you will see gains from removing the cat, i'd say probably around 1-2hp. It will not be as clean, and it will have a different tone, if you can deal with that, and don't have a moral issue with causing more pollution lol then go for it

qtiger · 02-07-2003, 01:07 AM

#1 Backpressure is bad unless you have a 2 stroke motor.

#2 I don't think you'll gain 1-2 hp unless your cat is clogged.

#3 You will make the trees cry.

Superist · 02-07-2003, 12:48 PM

For starters you do need backpressure for almost all cars(n/a). Backpressure is good thing for your valves. look at all the cars w/ theses huge exhausts that are bigger than 3" for a n/a car, they sound like a can-o -angry-bees,and you loose torque, and not just a little.......