with or without cat?
Thread Starter
Junior Member
Joined: Jan 2003
Posts: 38
Likes: 0
From: chile
with or without cat?
hi everyone.
when i bought my car the cat was broken, so i decided to take it off.
now i need to pass legal inspection so i have to put a new cat.
the question is, does car performance change with or without cat?
thanks
when i bought my car the cat was broken, so i decided to take it off.
now i need to pass legal inspection so i have to put a new cat.
the question is, does car performance change with or without cat?
thanks
Joined: Jan 2002
Posts: 818
Likes: 0
From: Hampden Maine
Car: 1992 Firebird
Engine: Stealth Rammed 412 with TC78 Turbo
Transmission: '93 T-56
Axle/Gears: 3.27 9 bolt posi with PBR discs
That's been debated a few times here. In fact I had the same question when I went from having a 3" straight pipe to having a 3" Magnaflow high flow cat (to pass visual inspection) installed in my car. The general concensus I got was that most people feel that with a high flow cat performance really won't be affected at all. The exhaust note will be toned down some, which was good for me, because I couldn't drive my car for more than an hour at a time without getting a headache. Now with the cat in there it's nowhere near as bothersome, but the exhaust still sounds good. Not as loud, but super loud isn't always what you want. Basically from what I understand if you throw a high flow cat in the system it shouldn't affect performance much at all, but I'm sure others here can add to my comments, since I am FAR from an exhaust expert 
-Paul
-Paul
Junior Member
Joined: May 2003
Posts: 60
Likes: 0
From: S.A. Texas
Car: 84 Z28, 91 Corvette, 94 T/A, 02 Dodge Ram QuadCab 1500
Engine: 350 SBC
Transmission: 5spd
I have ran my car without cats for a few years. Now I have come to realize that the fumes without the cat tend to give me headaches and makes my clothes smell like fumes.
Just with the car idling next to the house makes my eyes water.
Granted, my 650 holley dblpump runs rich at idle but from what I've read here, it seems the I am not the only one who finds the fumes irritating.
Even though I like the deeper sound you get without the cats, I still plan to reinstall some highflow cats.
And that's my 2 pennies.
Just with the car idling next to the house makes my eyes water.
Granted, my 650 holley dblpump runs rich at idle but from what I've read here, it seems the I am not the only one who finds the fumes irritating.
Even though I like the deeper sound you get without the cats, I still plan to reinstall some highflow cats.
And that's my 2 pennies.
Senior Member
Joined: Jul 2002
Posts: 512
Likes: 0
From: Oviedo, FL
Car: 1984 Trans Am WS6
Transmission: 700r4 Highly Modified
Well, here's my problem. My car has bad exhaust fumes with the cat which is a high flow and is only 2 years old. I run no other emissions and a 600 DP on my current engine though, so it is likely that the cat has gone bad.
I know of a few cars that don't run cats and they don't smell at all. Their cars must be tuned better I guess.
I know of a few cars that don't run cats and they don't smell at all. Their cars must be tuned better I guess.
Moderator
Joined: Jul 2001
Posts: 5,225
Likes: 70
From: Buffalo, NY
Car: 1988 IROC-Z
Engine: 427 SBC
Transmission: ProBuilt 700R4
Axle/Gears: Moser 12 Bolt / 3.73 TrueTrac
Originally posted by bowtie350_428
Just with the car idling next to the house makes my eyes water.
Just with the car idling next to the house makes my eyes water.
Sounds like more of a serious problem then having no cat
Thread
Thread Starter
Forum
Replies
Last Post
LT1Formula
Engine/Drivetrain/Suspension Parts for Sale
7
Oct 8, 2015 08:34 PM
