Quick! CAT removal - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

Reply
 
 
 
Thread Tools Search this Thread
Old 02-20-2003, 12:57 AM   #1
Senior Member
True Car Nut
Thread Starter
 
Join Date: Oct 2002
Location: Genoa, Illinois
Posts: 4,013
Thanks: 0
Thanked 0 Times in 0 Posts
Allmachtige is on a distinguished road
Default Quick! CAT removal

I know its illegal, but has anyone done it? If so how much louder is it? Enough to attract the police?
Allmachtige is offline   Reply With Quote
Old 02-20-2003, 01:51 AM   #2
Junior Member
Posts like a Ricer Type-R
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default

Shouldn't be too noticeable. Most of the sound is taken care of by the muffler. Getting pretty bad now?
willwren is offline   Reply With Quote
Old 02-20-2003, 01:53 AM   #3
Senior Member
True Car Nut
Thread Starter
 
Join Date: Oct 2002
Location: Genoa, Illinois
Posts: 4,013
Thanks: 0
Thanked 0 Times in 0 Posts
Allmachtige is on a distinguished road
Default

No its not the cat, read the "Oh Crap!" thread. Its just that the mechanic is willing to do something about the CAT tomarrow. Maybe bypass it by punching through it with a straight pipe or just removing it all together.

To be "legal" I rather punch it.
Allmachtige is offline   Reply With Quote
Old 02-20-2003, 11:45 AM   #4
Junior Member
 
Join Date: May 2002
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
SSEi95 is on a distinguished road
Default

I have no cat or resonator on mine. I also have 3" exhaust pipe and a straight thru muffler. It is probably a little noisier that you would want for the typical family cruiser but it isn't overbearingly load either. It has a GREAT rumble at idle but picks up to a little higherpitch as you drive. You could run straight pipes on a Bonneville as long as you don't "drop the hammer" in front of a cop, then they'll know.

So basically, I did it here in MN and I haven't had a problem with the noise level yet.
SSEi95 is offline   Reply With Quote
Old 02-20-2003, 12:09 PM   #5
Senior Member
True Car Nut
Thread Starter
 
Join Date: Oct 2002
Location: Genoa, Illinois
Posts: 4,013
Thanks: 0
Thanked 0 Times in 0 Posts
Allmachtige is on a distinguished road
Default

Hmm....thanks for the input. I'll see how willing the mechanics are, because its hard to find one that will do it for you.

However I heard some shops won't work on a car if there is no CAT. Is this rubbish or possibly the truth?
Allmachtige is offline   Reply With Quote
Old 02-20-2003, 12:35 PM   #6
Senior Member
Posts like a Northstar
 
Join Date: Jan 2003
Location: Northern KY
Posts: 511
Thanks: 0
Thanked 0 Times in 0 Posts
Phantom is on a distinguished road
Default

Find one that will make it a blot up so you can easily remive and replace and Tell the machinacs that you are doing this for better times at the strip only for lower times.

My friend did it him self this winter in this dads garage actual car garage so it was easer.
Phantom is offline   Reply With Quote
Old 02-20-2003, 01:09 PM   #7
Senior Member
True Car Nut
 
Join Date: May 2002
Location: Edmonton, AB Canada
Posts: 2,621
Thanks: 0
Thanked 0 Times in 0 Posts
DeathRat is on a distinguished road
Default Re: Quick! CAT removal

Quote:
Originally Posted by Allmachtige
I know its illegal, but has anyone done it? If so how much louder is it? Enough to attract the police?
Been there & done that 4 years ago! Never got a ticket yet! But, then again I installed a resonator (glass pack) to quiet it down a little too.
DeathRat is offline   Reply With Quote
Old 02-20-2003, 03:26 PM   #8
Junior Member
 
Join Date: May 2002
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
SSEi95 is on a distinguished road
Default

I had a local speed shop do the installation. All I had to do was sign a simple (and I mean simple) form that states I know this is for off road use only. Then their butts are covers and they happily did it for me.
SSEi95 is offline   Reply With Quote
Old 02-20-2003, 03:39 PM   #9
Senior Member
True Car Nut
 
Join Date: Sep 2002
Location: Chicago, IL
Posts: 2,409
Thanks: 0
Thanked 1 Time in 1 Post
acg_ssei is on a distinguished road
Default Re: Quick! CAT removal

Quote:
Originally Posted by Allmachtige
I know its illegal, but has anyone done it? If so how much louder is it?
Not much; the muffler does most of that work.

Quote:
Originally Posted by Allmachtige
Enough to attract the police?
The noise won't, but the smell might, if they're really bothering to look for disconnected cats and they're following right behind you down the street. Your exhaust may smell like a cheap lawnmower without the cat in place doing its thing.

Besides, if you're looking to reduce backpressure, a properly-functioning convertor doesn't contribute much to that.
acg_ssei is offline   Reply With Quote
Old 02-21-2003, 12:10 AM   #10
Senior Member
True Car Nut
Thread Starter
 
Join Date: Oct 2002
Location: Genoa, Illinois
Posts: 4,013
Thanks: 0
Thanked 0 Times in 0 Posts
Allmachtige is on a distinguished road
Default

Yeah I've been told that by just punching the CAT through and cleaning it out doesn't hurt at all. I thought having an open area like that would mess with the flow, but apparently it won't. Still dunno what I'm gonna do...gonna finish up my exhaust tomarrow. Its really bad, I never told you guys that. The shop that did it before was terrible. Now I'm getting it redone from the CAT back--all new.
Allmachtige is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
QUICK! QUICK! SPEED! QUICK! ferullo0 Performance, Brainstorming & Tuning 3 05-07-2007 05:09 PM
quick an d cheap Cat MikeDiaz 1987-1991 13 10-02-2005 11:38 AM
To CAT or not to CAT... Sol Performance, Brainstorming & Tuning 11 07-08-2004 08:19 AM
High Flo Cat vs No Cat blackssei 2000-2005 3 05-23-2004 02:45 AM
cat or no cat? iz zero back pressure ok? or.. no? delta8t8 1987-1991 3 06-16-2003 10:57 AM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 10:19 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.