chadaclysm

OK, I gutted my cats and everything has been fine, but I've noticed that when it is cold out my car seems to dump an ungodly amount of exhaust out the rear. I'd almost describe it as "pouring" out the back lol. I obviously assumed the car would be putting more stuff into the air without cats, but it just seems kind of excessive. Is this common for people without cats, or do I have another issue?? The car is running fine and this is only noticeable when it is cold out.

RPM WS6

iTrader: (3)

The amount of exhaust is the same, with or without cats. It's just no longer filtered.

hcb1700

iTrader: (9)

That shouldn't happen. I have a 78 Z28 with true duals and no cats, and I have no smoking problems or anything like that. My brothers 2001 Z28 has gutted cats as well and there is no problem with it. Do you have any upgrades, if so have you tuned your car?

Transam1

iTrader: (6)

yep, mine does that...when its cold/frosty white just pours out the tips about 10x as bad as the car next to me at the stoplight

blk/slvr02ss

iTrader: (21)

Thats normal because the cat's break down the gas which are now passing right threw.

chadaclysm

Thanks guys. Like I said, it isn't smoke, it is just exhaust. The car only does it when it is cold. I figured it was just all the unbroken down fumes, but I'm really paranoid about my car

RedHottG2

iTrader: (14)

Yea that's normal, when I did my cats I noticed all the exhaust coming out also and was like DANG!. Nothing to worry about..

00T/AWS6

iTrader: (17)

hahaha yea you're fine you should seee mine does the same just pours out the exhaust.

TheBlueKnight

iTrader: (4)

maybe it just looks like more exhaust when its cold. like when its freezing out and your breathe looks like smoke

608kZ28

mine does the same thing. when im at red lights people look at me like my car is on fire. lol

araber89

iTrader: (3)

Nothing to worry. But just curious to make sure you either got O2 sims or tuned the O2's out

chadaclysm

yep, got the rears tuned out.

nemss1

Id go with an ORY pipe. Gutted cats causes turbulence in exhaust flow

desertLS1

iTrader: (8)

I'm with you on this one.
I don't understand why people do this.
Emissions? Keep it stock then lol

CH@Dbee

dont worry about it, all my catless cars have done that.......it makes for cool pictures too

blackz28x07

I have a lot of exhaust coming out of my car also. I don't drive it in the winter, but when i start it every week and let it warm up all the way. I have just an open y pipe so steam comes from all around the bottom of the car. It looks pretty cool haha

MyFirstLS1

iTrader: (8)

just wait til you are at a red light and something comes up behind with hids then the smoke looks really cool. Mine does it to when it is cold outside

BlueMagicSS

iTrader: (4)

When the car is cold the o2 sensors are cold as well, so the vehicle is in Open loop and running rich until the o2s warm up and can properly meter air/fuel ratio...

RPM WS6

iTrader: (3)

Probably incase of a visual inspection by cops. Only reason I can think of.