stoon_cobalt_colby

im wondering will i lose hp by hacking up a stock dp making it catless i know i prob wont gain any hp but im just wondering will i need a tune for it right away and wondering if im gonna lose hp anyone wanna help me out

wtpcobaltss

no its not neccessary for a tune u would actually being freeing up alot of exhaust flow but if u already have a header and crap that has been tuned i wouldnt worry about it. atleast u wont have to worry about it getting clogged and causing excessive exhaust temps and backpressure.

stoon_cobalt_colby

i see u got a stock catless dp u got a video by any chance?

wtpcobaltss

yea man but the quality isnt that great for the sound my windows are up
http://www.youtube.com/watch?v=23ATPcPIPmo

maybe they were cracked alittle i can hear wind but it was like 35 degreess outside.

stoon_cobalt_colby

i cant tell if the catless makes it sound diffrent or not

Frew

iTrader: (9)

get ride of the cat, it caused nothing but problems for me, it was throwing off my afrs and causing my car to lean up under wot, so i ended up turning off the cat over temp sensor so i could fine tune the afrs, a month later i just ended up getting a catless downpipe and i could be happier, i just used the catted pd for when inspection comes around

silverbullet08

I took a long drill bit and just drilled my cat out. Worked like a charm. There really isnt any other way to do it unless you just completly cut the cat off. My car was significantly louder, and i could actually feel a little bit of a difference. I kept blowing them up with the factory stage 2 tune and pully. For the rear o2 go buy 2 spark plug anti foulers from autozone looks like a tube with a little hole in the middle and threaded on the outside. combine them and put it between your O2 and your pipe. that will keep your CEL off.

stoon_cobalt_colby

ok nice thanks hope it doesnt need tune rightaway but if it does than i will get rear 02 code removed during the tune so i dont get cel every day so ur happy with catless?

im gonna cut the cat right off and weld in new pipe where cat was and do u got a video of sound or no?flyby would be best

ShortStack

I had catless.

Was a little raspy but thats because i had a exhaust with no resonator. As soon as i got a resonator welded into my cat back.. the sound was awesome.

stoon_cobalt_colby

nice i got a megan muffler on stock piping right now i got silencer if i want it quiet i think for 50 bucks its worth a try

Frew

iTrader: (9)

make sure you dont just gut the cat, its dyno proven that you lose a couple horse dude to turbulence caused by the inside of the guted cat, i rally didnt notice it being that much louder a little sharper, and i have three inch from the header back with a resonator

stoon_cobalt_colby

if i cut the whole cat out and replace it with new pipe i wont lose hp will it?

ssyellowss

iTrader: (1)

no you will actually gain some. by removing that restriction the exhaust gases can exit faster. low end torque might suffer some, but on the dyno mine really didnt. dont have dyno graphs on hand but i dynoed at 242hp/202tq with just catless and 212/201 stock.

stoon_cobalt_colby

tight

stoon_cobalt_colby

if anyone got sound clips of catless please post fly by would be best or inside with windows down