Chevrolet Forum - Chevy Enthusiasts Forums

Notices
Silverado & Fullsize Pick-ups The Silverado has been one of the best selling trucks in the US for decades, and is truly proven to be "like a rock".

2014 Chevy Silverado
Platform: Truck, GMT 400, 800, & 900
Sponsored by:
Sponsored by: DashLynx

cat question

Thread Tools
 
Search this Thread
 
Old June 25th, 2012, 12:08 AM
  #1  
CF Senior Member
Thread Starter
 
Doug Roberts's Avatar
 
Join Date: Feb 2012
Posts: 330
Likes: 0
Received 2 Likes on 2 Posts
Default cat question
99 silverado I have 3in pipes i was thinking about cleaning out cat I live in FL and not smog laws but will I lose back pressure
Doug Roberts is offline  
Reply Like
Old June 25th, 2012, 9:00 AM
  #2  
CF Monarch
 
kevinkpk's Avatar
 
Join Date: Jul 2011
Location: kevinkpk
Posts: 5,917
Received 138 Likes on 130 Posts
Default
Originally Posted by Doug Roberts
99 silverado I have 3in pipes i was thinking about cleaning out cat I live in FL and not smog laws but will I lose back pressure
You don't want back pressure.
kevinkpk is offline  
Reply Like
Old June 25th, 2012, 9:36 AM
  #3  
CF Junior Member
 
Mudd Mutt's Avatar
 
Join Date: Jun 2012
Location: Kansas
Posts: 57
Likes: 0
Received 0 Likes on 0 Posts
Default
You do want some back pressure. Without any at all you'll burn up your valves. If there's a muffler on it your good but without a muffler or cats your valves will burn and you'll lose compression
Mudd Mutt is offline  
Reply Like
Old June 25th, 2012, 9:48 AM
  #4  
Super Moderator
 
country_09's Avatar
 
Join Date: Jul 2009
Location: Highlands
Posts: 2,197
Likes: 0
Received 2 Likes on 2 Posts
Default
^ correct. Only want some. So keep a muffler on it, don't run compete straights with no cats or muffler.
country_09 is offline  
Reply Like
Old June 26th, 2012, 12:13 AM
  #5  
CF Veteran
 
cleveland63b's Avatar
 
Join Date: Feb 2012
Location: nebraska
Posts: 1,433
Likes: 0
Received 0 Likes on 0 Posts
Default
you want scavenging not backpressure (close but they're different) and smog state or not you'd be better off getting a high flow cat.
cleveland63b is offline  
Reply Like
Old June 26th, 2012, 10:43 PM
  #6  
CF Senior Member
Thread Starter
 
Doug Roberts's Avatar
 
Join Date: Feb 2012
Posts: 330
Likes: 0
Received 2 Likes on 2 Posts
Default
Thanks guys was ready to cut and gut
Doug Roberts is offline  
Reply Like
Old June 27th, 2012, 10:23 AM
  #7  
Super Moderator
 
country_09's Avatar
 
Join Date: Jul 2009
Location: Highlands
Posts: 2,197
Likes: 0
Received 2 Likes on 2 Posts
Default
Don't get me wrong, i've cut mine off. But I cut them off for a reason. Both of them were clogged so when I gut em, a huge power increase came with it. It's not like that if nothing's wrong with em
country_09 is offline  
Reply Like

Trending Topics

Old June 27th, 2012, 3:19 PM
  #8  
CF Senior Member
Thread Starter
 
Doug Roberts's Avatar
 
Join Date: Feb 2012
Posts: 330
Likes: 0
Received 2 Likes on 2 Posts
Default
Well I need a muffler then ill cut and gut
Doug Roberts is offline  
Reply Like
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Exhaust and cat related question
ericnottelin
Silverado & Fullsize Pick-ups
1
June 13th, 2015 11:21 AM
before cat or after cat O2 sensors?
ericnottelin
Silverado & Fullsize Pick-ups
4
July 2nd, 2012 10:03 PM
Tech question on cat. conv.
DeeZ
Silverado & Fullsize Pick-ups
1
March 30th, 2009 7:01 PM
Full cat-back vs muffler upgrade
marsalisjr
Tahoe & Suburban
66
June 8th, 2007 11:49 PM
Question about cat back exhaust:
andrewmickey17
Cavalier
1
October 11th, 2006 1:30 PM
Tags
Back to Subforum
Silverado & Fullsize Pick-ups
View Next Unread
wheel size




Advanced Search
Quick Reply: cat question


Reply Closed Thread Share

All times are GMT -5. The time now is 9:47 AM.