hollow cats?
Moderator
Joined: Dec 2001
Posts: 22,436
Likes: 17
From: Louisville,Ky.
1) Bad idea
2) Highly illegal
3) Sounds funny
4) Creates a lot of turbulence and backpressure in the hollow cat.
5) Exhaust will stink
6) Did I mention illegal?
It's not worth the hassle of cutting the pipes apart to get to them to remove the guts. Just have a new Y pipe made with 2 high-flow converters, although, the originals aren't very restrictive.
2) Highly illegal
3) Sounds funny
4) Creates a lot of turbulence and backpressure in the hollow cat.
5) Exhaust will stink
6) Did I mention illegal?
It's not worth the hassle of cutting the pipes apart to get to them to remove the guts. Just have a new Y pipe made with 2 high-flow converters, although, the originals aren't very restrictive.
Senior User
Joined: Apr 2006
Posts: 331
Likes: 0
Very bad idea, those that are doing it are telling you it is great because they think that noise = power.... it doesn't. You WILL lose power by hollowing it out. If you have your head stuck on doing it then cut them out and replace it with a peice of pipe, you will have much better scavenging but it will be loud and sound like a chainsaw that backfires.
If your cats are failing (broken/melted) then cut them out and replace the 4 with 2 high flow cats, it will sound great and you may gain a little bit of power.
If your cats are failing (broken/melted) then cut them out and replace the 4 with 2 high flow cats, it will sound great and you may gain a little bit of power.
Junior User
Joined: Jan 2008
Posts: 59
Likes: 0
Yeah real bad idea. If you end up having to replace these things be prepared because they are hellishly expensive. And yes it will give you a trouble code.
I lost the cats on the left side of mine and it coded up faulty cat. It cost me 1200 bucks to replace the one side only.
I lost the cats on the left side of mine and it coded up faulty cat. It cost me 1200 bucks to replace the one side only.
Senior User
Joined: Apr 2006
Posts: 331
Likes: 0
you can get aftermarket ones that are a fraction of the cost of new ones. magnaflow makes some, there is a sponser on this site as well that sells cats. You can get direct fit ones ($$$$) or just normal ones and have them welded in by a good exhaust shop.
If you replace the 4 with 2 you will not get a check engine light. If you gut them you probably will get one unless you get some MIL eliminators or use a tuner to remove the checks from the PCM.
I spend about $600 CDN to replace the 4 with 2 Magnaflow cats with new pipe. I couldn't be happier.
If you replace the 4 with 2 you will not get a check engine light. If you gut them you probably will get one unless you get some MIL eliminators or use a tuner to remove the checks from the PCM.
I spend about $600 CDN to replace the 4 with 2 Magnaflow cats with new pipe. I couldn't be happier.
Thread Starter
|
Cargo Master
Joined: Sep 2005
Posts: 2,963
Likes: 897
From: Montana
sounds like 2 high flows is the way to go... No sniff test in my county but I would doubt if it happened soon. I also don't want to have to deal with the codes, etc. Thanks guys
Thread
Thread Starter
Forum
Replies
Last Post
madmiggie276
1987 - 1996 F150 & Larger F-Series Trucks
13
Jan 31, 2012 08:43 PM
