gutting cats?
Thread Starter
|
Junior User
Joined: Sep 2006
Posts: 73
Likes: 0
gutting cats?
i just put on a cat back system on my 95 f150, 5.0l.. its a flowmaster 40 series with two 2.5in pipes out the back. it sounds good but not what i expected. i only drive about 3000 miles a year. would it be any louder it i gut the rear cat out?
Elder User
Joined: Nov 2006
Posts: 566
Likes: 1
From: Virginia
tgil I had the same setup on my 92 150 with the 302. Flowmaster 40 SI/DO 2.5" pipe. It sounds pretty weak. I got a glasspack on there now with a 24 or 25 inch case length, and I am equally disappointed. It is more crisp but the same volume. I think I'm going to jump to a 12" glasspack now.
Posting Guru
Joined: May 2004
Posts: 2,161
Likes: 1
From: Prince George, B.C.
Not in all states and most of Canada. Besides, you can go with high flow cats if you are in fact worried about the enviroment. I personally prefer to get as much junk out of my vehicles as possible. IE: '88 RX-7, came from factory with 3 cats, currently, none. Why? I was tired of getting cooked out of the car from the heat, the floor actually gets HOT.
Trending Topics
Elder User
Joined: Mar 2003
Posts: 689
Likes: 1
From: VA
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Senior User
Joined: Mar 2003
Posts: 397
Likes: 0
From: nova scotia, canada
no we didnt sign kyoto, to many ways around the rules and no way to meet it in its time frame. plus weve been lowering emmisions and cleaning up the enviroment long before it came into this fad.
this kinda explains it.
http://www.cbc.ca/news/background/kyoto/timeline.html
this kinda explains it.
http://www.cbc.ca/news/background/kyoto/timeline.html
Former ******
Joined: Nov 2004
Posts: 4,901
Likes: 2
From: Salt Lake City, Utah
Gutting cats is illegal in all 50 states. Most of Canada tolerates it however.
Let me explain the functions of the two cats. The front cat on this setup is a reduction catalyst. This means that it breaks down NOX into Nitrogen and Oxygen. It has little effect on HCs and COs however. The oxygen being released from the first can, plus some that has been stored in the catalyst itself reacts with HC and CO in the second cat to produce clean emissions. The factory cats are not restrictive for a stock setup. However, if you increase the pipe size, they may be the choke point. I recommend replacing the front cat with a 3 way high performance aftermarket. If you use a 3-way replacement, you wont need the rear cat, and everything will work as it should. Don't be fooled by most "high flow" aftermarket converters, they are inferior to your factory cat. If you want a real high flow converter that will perform well enough to justify its being there, check out www.bearriverconverters.com.
Let me explain the functions of the two cats. The front cat on this setup is a reduction catalyst. This means that it breaks down NOX into Nitrogen and Oxygen. It has little effect on HCs and COs however. The oxygen being released from the first can, plus some that has been stored in the catalyst itself reacts with HC and CO in the second cat to produce clean emissions. The factory cats are not restrictive for a stock setup. However, if you increase the pipe size, they may be the choke point. I recommend replacing the front cat with a 3 way high performance aftermarket. If you use a 3-way replacement, you wont need the rear cat, and everything will work as it should. Don't be fooled by most "high flow" aftermarket converters, they are inferior to your factory cat. If you want a real high flow converter that will perform well enough to justify its being there, check out www.bearriverconverters.com.
Posting Guru
Joined: Jun 2002
Posts: 1,214
Likes: 0
From: Rio Rancho USA
Originally Posted by Wr3ckin_Cr3w
what if i just put in a flowmaster muffler. does that bother anything?
Cats have to be the same type, and in the same location to meet all rules and regs put forth by the feds. That means no removing them or trying to run less than the factory installed.
Former ******
Joined: Nov 2004
Posts: 4,901
Likes: 2
From: Salt Lake City, Utah
There are exceptions. The EPA approves certain converter models to replace multiple units on some vehicles. The catalyst manufacturer will publish this information in their application guides. If it is not in the guide, then you will need to retain the factory arrangement. The converters I carry are approved to replace multiple units on the Ford trucks on models that do not use air injection between the cats. If you have the air tube between the cats, you will need to use mulptiple replacement converters.
Thread
Thread Starter
Forum
Replies
Last Post
Pridnjoy
6.0L Power Stroke Diesel
5
Apr 13, 2014 12:09 PM
IowanStraight6
1987 - 1996 F150 & Larger F-Series Trucks
27
Dec 7, 2010 11:25 AM
