454 exhaust - 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 08-29-2012, 01:37 PM   #1
Junior Member
Thread Starter
 
Join Date: Aug 2012
Location: UTAH
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
logan301 is on a distinguished road
Default 454 exhaust

I am thinking about doing and exhaust on my 7.4 L (454). I have been back and forth on whether or not to leave my cats in or to take them out and put dummy O2 sensors in. Also i am worried about the sound and what muffler to put on. Any suggestions?
logan301 is offline   Reply With Quote
Old 08-29-2012, 01:47 PM   #2
Senior Member

True Car Nut
 
2kg4u's Avatar
 
Join Date: Sep 2006
Location: Windsor, Ontario / Detroit, Michigan
Posts: 4,804
Thanked 220 Times in 181 Posts
2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of
Default

What kind of vehicle? Do you require emissions testing where you live?
2kg4u is offline   Reply With Quote
Old 08-29-2012, 05:41 PM   #3
Junior Member
Thread Starter
 
Join Date: Aug 2012
Location: UTAH
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
logan301 is on a distinguished road
Default

Its a 98 gmc truck and no there is no emissions testing here.
logan301 is offline   Reply With Quote
Old 08-29-2012, 08:21 PM   #4
Senior Member
True Car Nut
 
jwfirebird's Avatar
 
Join Date: Dec 2009
Location: western,ny state
Posts: 9,616
Thanked 563 Times in 481 Posts
jwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond repute
Default

you can take the cats off and use the dummy sensors for the rear o2'* but the better thing to do is get a tune where they are tuned out. sound is subjective it depends what you like. i had a 89 350 i took the cat off of and ran just a summit muffler i think it sounded good, fairly mild at idle and semi quiet inside but if you get on it it was reasonably loud.
jwfirebird is offline   Reply With Quote
Old 08-29-2012, 09:05 PM   #5
Junior Member
Thread Starter
 
Join Date: Aug 2012
Location: UTAH
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
logan301 is on a distinguished road
Default

Where would i get the tuner?
logan301 is offline   Reply With Quote
Old 08-30-2012, 05:25 AM   #6
Senior Administrator








Certified Car Nut
 
Mike's Avatar
 
Join Date: Jul 2003
Location: Horseheads, NY
Posts: 15,649
Thanked 1,001 Times in 777 Posts
Mike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond repute
Default

You could either send in your PCM to a tuner shop to have those things turned off, or you can pony up the $500 for your own tuner and tune it out yourself. Downside to sending your PCM in is, you lose your PCM for about a week or so, and it runs you about $100 or so to have it done.
Mike is offline   Reply With Quote
Old 08-30-2012, 08:58 AM   #7
Senior Member
True Car Nut
 
jwfirebird's Avatar
 
Join Date: Dec 2009
Location: western,ny state
Posts: 9,616
Thanked 563 Times in 481 Posts
jwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond repute
Default

places like blackbear have a deposit you can do and they will send you one you send them yours later. if i was going to do that i would have them turn off the evap and security to prevent future common issues
jwfirebird is offline   Reply With Quote
Old 08-30-2012, 03:07 PM   #8
Junior Member
Thread Starter
 
Join Date: Aug 2012
Location: UTAH
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
logan301 is on a distinguished road
Default

If I were to buy a tuner what one would i get and where? Also is there a website or a phone number for blackbear?
logan301 is offline   Reply With Quote
Old 08-30-2012, 03:24 PM   #9
Senior Member

True Car Nut
 
2kg4u's Avatar
 
Join Date: Sep 2006
Location: Windsor, Ontario / Detroit, Michigan
Posts: 4,804
Thanked 220 Times in 181 Posts
2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of
Default

2kg4u is offline   Reply With Quote
Old 08-30-2012, 05:56 PM   #10
Senior Member
True Car Nut
 
rjolly87's Avatar
 
Join Date: Jun 2003
Location: Las Cruces, NM
Posts: 6,857
Thanked 298 Times in 246 Posts
rjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant future
Default

Given that catalytic converters are a federal requirement if equipped from the factory, and the fines are quite annoying when you are caught without them, and there is a bounty for ratting people out that don't have them, I am just going to have to suggest some nice high flow units.
rjolly87 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Engine problems on a 1989 gmc r3500 with a 454 tbi. wes104 GMC/Chevrolet Truck/SUV 8 04-07-2014 10:57 PM
oil coming from somewhere in front of my 454 tbi??? greg37 General GM Chat 2 04-22-2012 11:00 AM
Exhaust Question : Headers & Exhaust Charlie Performance, Brainstorming & Tuning 29 08-09-2004 11:03 PM
1970 LS6 454 Chevelle Auctions...... givemebreak Lounge 7 04-18-2004 12:41 PM
R.I.P. 454... TrueWildMan General GM Chat 6 09-09-2003 09:54 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 12:00 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.