Performance Cat or removing it?? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

Reply
 
 
 
Thread Tools Search this Thread
Old 09-09-2005, 03:07 PM   #1
Senior Member
Posts like a Camaro
Thread Starter
 
Join Date: Apr 2005
Location: montreal, Canada
Posts: 1,108
Thanks: 0
Thanked 0 Times in 0 Posts
mike_peperni is on a distinguished road
Default Performance Cat or removing it??

When i say removing it , its getting out all the stuff in it and keeping the "frame".


im planning that:
colder plug(installed)
3.25 pulley(got it, need a belt)
PCM
180stat(got it)
1.9 rocker
Ported manifold(may be)
Remove or buy a new cat.

i want to hit low 14'* on street tires. and also want to know if the cat help reduce knock retard or not.

a last question about the cat: does it sound good? i want to have a bit louder sound than stock but i dont want to waste money on an exhaust system.(the stock is OK from what i hear here )

for any hint.
mike_peperni is offline   Reply With Quote
Old 09-09-2005, 03:11 PM   #2
Senior Member
Posts like a Corvette
 
Join Date: Jan 2004
Location: Montréal, QC
Posts: 1,374
Thanks: 0
Thanked 0 Times in 0 Posts
Foghorn is on a distinguished road
Default

For the price of a high flow cat there is no reason to remove it.

Cheers,
Foghorn is offline   Reply With Quote
Old 09-09-2005, 04:17 PM   #3
Senior Member
Posts like a Turbo
 
Join Date: Aug 2003
Location: Ashland, Ohio
Posts: 423
Thanks: 0
Thanked 0 Times in 0 Posts
jgs11 is on a distinguished road
Default

if you drop to the 3.25 you better at least port the manifolds along with your other mods
jgs11 is offline   Reply With Quote
Old 09-09-2005, 06:06 PM   #4
Senior Member
Posts like a Camaro
Thread Starter
 
Join Date: Apr 2005
Location: montreal, Canada
Posts: 1,108
Thanks: 0
Thanked 0 Times in 0 Posts
mike_peperni is on a distinguished road
Default

ok, for the advice, but did a performance cat will give more hp or simply remove the inside of the stock one will give same result?

i look around here and cant find performance cat for bonneville or GTP.

it look more simple to remove the inside of my stock one.

i can have it done for 60$ can.

did you know a place foghorn in montreal where i can get one? if its the better choice.

mike_peperni is offline   Reply With Quote
Old 09-09-2005, 07:10 PM   #5
Senior Member
Posts like a Turbo
 
Join Date: Aug 2003
Location: Ashland, Ohio
Posts: 423
Thanks: 0
Thanked 0 Times in 0 Posts
jgs11 is on a distinguished road
Default

Personally i would probably go with the carsound 94009 high flow cat found here...http://www.justmagnaflow.com/Catalyt...ters/94000.htm Justmagnaflow.com has the best prices around. This is a very good high flowing cat and many of us have had good luck with it and its reasonably priced. Good luck.
jgs11 is offline   Reply With Quote
Old 09-09-2005, 10:14 PM   #6
Senior Member
Posts like a 4 Banger
 
Join Date: Mar 2005
Location: Appleton, WI
Posts: 124
Thanks: 0
Thanked 0 Times in 0 Posts
2seater is on a distinguished road
Default

From the air flow testing of a stock 2.25" cat on my flowbench, gutting it will add approx. 50% flow over stock. A straight pipe of the same diameter and length will more than double the flow capacity. I have been unable to test a high flow cat to see the actual flow capacity. Inlet and outlet size of the cat should make little difference, it is the size and makeup of the matrix that will matter the most. Not advocating one way or the other, but from actual testing, the hollow cat. must have a lot of turbulence or the flow would be closer to a straight pipe.
2seater is offline   Reply With Quote
Old 09-09-2005, 10:33 PM   #7
Junior Member
 
Join Date: Jun 2002
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
2000SilverBullet is on a distinguished road
Default

With identical mods the car with the Cat will be .2 sec faster in the quarter. PDad and I proved that last year. He removed his Cat this year.
....and it sounds much better without it. :P
2000SilverBullet is offline   Reply With Quote
Old 09-09-2005, 11:02 PM   #8
Senior Member
Posts like a Camaro
Thread Starter
 
Join Date: Apr 2005
Location: montreal, Canada
Posts: 1,108
Thanks: 0
Thanked 0 Times in 0 Posts
mike_peperni is on a distinguished road
Default

Quote:
Originally Posted by 2000SilverBullet
With identical mods the car with the Cat will be .2 sec faster in the quarter. PDad and I proved that last year. He removed his Cat this year.
....and it sounds much better without it. :P
you mean with the high flow cat?

.2 is a big difference!
and how much from stock?
mike_peperni is offline   Reply With Quote
Old 09-10-2005, 12:24 PM   #9
Junior Member
 
Join Date: Jun 2002
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
2000SilverBullet is on a distinguished road
Default

Quote:
you mean with the high flow cat?

.2 is a big difference!
and how much from stock?
I mean with no Cat. That'* what I've been saying all along but no one believed me that the cat makes that big a difference. Most will deny it because of environmental and legal concerns.

See my signature for mods. Last year when we proved the difference I had everything except the rockers and Lsd....and it was with a 3.4 pulley. This year we both had the same mods and both pulled a 13.9 quarter.
2000SilverBullet is offline   Reply With Quote
Old 09-10-2005, 10:38 PM   #10
Senior Member
Posts like a Camaro
Thread Starter
 
Join Date: Apr 2005
Location: montreal, Canada
Posts: 1,108
Thanks: 0
Thanked 0 Times in 0 Posts
mike_peperni is on a distinguished road
Default

cool! ill probably to it next weekend.

Aahhh... 13.9 ... may be one day

mike_peperni is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Removing cat questions The Snowman Performance, Brainstorming & Tuning 7 10-07-2009 10:45 PM
Removing Throttle Body without removing exhaust and shield? Hans 1992-1999 5 11-17-2004 04:52 PM
removing cat + O2 simulator = EGR malfunction? big_news_1 Performance, Brainstorming & Tuning 3 06-29-2004 03:38 PM
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 06:51 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.