Need Final Thoughts before I order - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


General GM Chat When starting new posts, please specify YEAR, MAKE, MODEL, ENGINE type, and whatever modifications you have made. Chat about all things GM (and related cars). Off-topic stuff should be in the Lounge, and all Model specific mechanical problems should be posted in the proper forum.

Reply
 
 
 
Thread Tools Search this Thread
Old 04-03-2004, 03:10 PM   #1
Senior Member
True Car Nut
Thread Starter
 
Join Date: Feb 2004
Location: Pennsylvania
Posts: 5,177
Thanks: 0
Thanked 0 Times in 0 Posts
Twister97 is on a distinguished road
Default Need Final Thoughts before I order

Here would be the cat I am getting...
http://cgi.ebay.com/ebaymotors/ws/eB...tem=2470688032

But looking at the Flowmaster 80 series, I noticed they only come in 2.5" and my 97 NA has a 2.25" diamater. Is this a major problem and I should look at other mufflers?
http://www.jegs.com/cgi-bin/ncommerc...08&prmenbr=361
Twister97 is offline   Reply With Quote
Old 04-03-2004, 03:44 PM   #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

You can use flanges to step up to the 2.5" component. NO problem at all. I did the same thing with my Cat. It'* a 3" cat, and I had my exhaust flared to fit OVER the 3" inlet/outlet. That'* the least restriction I could come up with. For all intents and purposes, my cat doesn't exist with regards to flow

Muffler is 2.5 inlet/outlet, but again, I flared OVER the fittings to prevent even a slight resistance to flow.
willwren is offline   Reply With Quote
Old 04-03-2004, 04:41 PM   #3
Senior Member
True Car Nut
Thread Starter
 
Join Date: Feb 2004
Location: Pennsylvania
Posts: 5,177
Thanks: 0
Thanked 0 Times in 0 Posts
Twister97 is on a distinguished road
Default

Awesome, should I get a 2.5" cat instead of a 2.25", so it will be the same size of the muffler?
Twister97 is offline   Reply With Quote
Old 04-03-2004, 05:56 PM   #4
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

I'll beat you to it, Twister. PM I just sent you:

Quote:
From: willwren
To: Twister97
Posted: Sat Apr 03, 2004 1:53 pm
Subject: Re: Cat sizing help
Compare your car to an SSE. You have the same engine, but the SSE has 2.5" exhaust. You can too. Now it can get expensive to replace the whole exhaust, so why not go 2.5" on both the cat and muffler? You might gain a little more than if you stayed with 2.25" components.

It might be a good compromise. It would be cool to see you do it, and at a meet sometime, compare to another 97SE for performance and sound. You can post any of this if you like Might get the thinking going in the right direction for you?
willwren is offline   Reply With Quote
Old 04-03-2004, 06:25 PM   #5
Senior Member
True Car Nut
Thread Starter
 
Join Date: Feb 2004
Location: Pennsylvania
Posts: 5,177
Thanks: 0
Thanked 0 Times in 0 Posts
Twister97 is on a distinguished road
Default

I think I am going to upgrade those two components to 2.5". Since the muffler shop will be able to use flanges to connect the 2.25" tubing to the 2.5" cat and muffler it sounds like a cool plan. As far as the rest of the piping goes from the engine to underneath of the car, that will stay the same and I wont have to replace those? Since I am on a budget it basically comes down to purchasing the muffler and cat then having the muffler house install the products. What was everyone elses price for their exhausts? I am just worried abuot I take it in to get it installed and they said they had to replace a lot of pipes for this exhaust to work and it costs $300 or something like that.
Twister97 is offline   Reply With Quote
Old 04-03-2004, 07:00 PM   #6
Senior Member
True Car Nut
Thread Starter
 
Join Date: Feb 2004
Location: Pennsylvania
Posts: 5,177
Thanks: 0
Thanked 0 Times in 0 Posts
Twister97 is on a distinguished road
Default

Well, I just ordered the Flowmaster 80 from Jegs. I know that size I can use no matter what so went ahead and got it today. Still debating what I should do with the Cat...I want the best performance but I dont want everything on my car to be replaced (pipes and tubings) and cost a bundle
Twister97 is offline   Reply With Quote
Old 04-04-2004, 12:05 AM   #7
Senior Member
True Car Nut
 
Join Date: Feb 2003
Posts: 3,684
Thanks: 0
Thanked 0 Times in 0 Posts
smellbird is on a distinguished road
Default

Post your results. As I hope to get some exhaust work done sometime soon, I'd like to see if the 2.5 is better than 2.25.
smellbird is offline   Reply With Quote
Old 04-04-2004, 12:07 AM   #8
Senior Member
True Car Nut
 
Join Date: Jan 2004
Location: Chicago,IL MWBF '04 SURVIVOR MWBF '05 SURVIVOR Napa Manager
Posts: 3,955
Thanks: 0
Thanked 0 Times in 0 Posts
Kennginn is on a distinguished road
Default

Quote:
Originally Posted by smellbird
Post your results. As I hope to get some exhaust work done sometime soon, I'd like to see if the 2.5 is better than 2.25.
me 2
Kennginn is offline   Reply With Quote
Old 04-04-2004, 03:40 AM   #9
Senior Member
True Car Nut
Thread Starter
 
Join Date: Feb 2004
Location: Pennsylvania
Posts: 5,177
Thanks: 0
Thanked 0 Times in 0 Posts
Twister97 is on a distinguished road
Default

Well, I ordered my cat. A carsound/magnaflow thing from ebay. Since this is the first mod I did for an exhaust on one of my cars, I decided to just stick with the 2.25" for the converter. The 2.5" was tempting but I really dont want to be shelling out money left and right. I figure if I really like this setup then maybe down the road I can upgrade the cat to a bigger size. The products will hopefully get here sometime this week. Once they are installed I will definately get pics up.
Twister97 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Final pictures before teardown (56k gravity well) OLDsman105 Your Ride: GM Pictures & Videos 8 10-18-2006 04:09 PM
Final wash before change... Lowrider0308 Your Ride: GM Pictures & Videos 16 11-08-2005 10:52 PM
Final thoughts on Exhaust porting willwren Performance, Brainstorming & Tuning 8 06-28-2005 10:24 AM
Give me some feedback on the ZZP TB before I order merlin Performance, Brainstorming & Tuning 3 04-01-2005 07:18 PM
help with error codes before I make before and after marks.. delta88 1992-1999 22 02-24-2003 12:17 PM


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 09:27 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.