Custom Exhaust
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Senior User
Joined: Nov 2006
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Custom Exhaust
Hi, I'm going to the city at the end of the month and want to get exhaust installed on my 05 FX4. My question is, do I need to keep a certain amount of back pressure to keep the engine and computer happy? I'de like to get true dual from the cats back, but I want to make sure that its not going to end up hurting performance or milage. Is it better to go with a custom true dual muffler shop install or a kit that is made for the vehicle?
Thanks
Thanks
MMNC (SS)(Ret)
Joined: Mar 2004
Posts: 11,606
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From: SE Georgia
cut the "Y" section out and don't touch the cats. you'll be just fine
the Cats maintain all the backpressure you'll ever need.
You can build a custom setup cheaper...it just matters more how much you want to spend and quality of materials. I would suggest you buy 2 Magnaflow bullet mufflers. The 12" ones are really loud. a more civilized tone can be produced with the 18" and 24" bullets
the Cats maintain all the backpressure you'll ever need.
You can build a custom setup cheaper...it just matters more how much you want to spend and quality of materials. I would suggest you buy 2 Magnaflow bullet mufflers. The 12" ones are really loud. a more civilized tone can be produced with the 18" and 24" bullets
MMNC (SS)(Ret)
Joined: Mar 2004
Posts: 11,606
Likes: 151
From: SE Georgia
in what way? 
each bank of the motor has 2 cats (4 total) and they are not inline or otherwise connected until after the cats where the exhaust comes together into a "Y" section. then it's all just 1 pipe out the rear of the truck
cutting out the "y" section gives you 2 completely seperate sides to the exhaust
each bank of the motor has 2 cats (4 total) and they are not inline or otherwise connected until after the cats where the exhaust comes together into a "Y" section. then it's all just 1 pipe out the rear of the truck
cutting out the "y" section gives you 2 completely seperate sides to the exhaust
MMNC (SS)(Ret)
Joined: Mar 2004
Posts: 11,606
Likes: 151
From: SE Georgia
cool. get some pics and part #'s up when you do. It'll make it easier for guys coming along to do the same thing...and a picture is always better than words
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Brett Foote
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From: North-Eastern, Ohio
I just unbolted my exhaust in front of the muffler and installed a glasspack muffler......thats it, no tailpipe or nothing. Driven the truck like this for 400-500 miles so far and hasn't tripped the "check engine" light, and it increased the mileage a bit.
Post Fiend
Joined: Jan 1997
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From: Enjoying the real world.
With the dual cats there's no need to get rid of the Y-pipe to get great flow. If the pipe where the Y comes together is cut off and replaced with a singler larger pipe and a larger single muffler, then split back out to duals again after the muffler it'll flow great without the added expense of dual pipes all the way back, 2 mufflers, etc.
Taking the muffler off isn't going to trip the check engine light since its mounted after the O2 sensors. Personally I'd never run any vehicle without at least a pipe coming out the side or back. Doing so can result in exhaust making its way into the cab. You can't smell the carbon monoxide in the cab, but it can kill brain cells regardless.
Taking the muffler off isn't going to trip the check engine light since its mounted after the O2 sensors. Personally I'd never run any vehicle without at least a pipe coming out the side or back. Doing so can result in exhaust making its way into the cab. You can't smell the carbon monoxide in the cab, but it can kill brain cells regardless.
5th Wheeling
Joined: Mar 2004
Posts: 41
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Hi, I'm going to the city at the end of the month and want to get exhaust installed on my 05 FX4. My question is, do I need to keep a certain amount of back pressure to keep the engine and computer happy? I'de like to get true dual from the cats back, but I want to make sure that its not going to end up hurting performance or milage. Is it better to go with a custom true dual muffler shop install or a kit that is made for the vehicle?
Thanks
Thanks
Post Fiend
Joined: Mar 2005
Posts: 8,542
Likes: 5
From: Louisiana
If at all possible, I'd like to hear a video/sound clip of the truck.
I have x type dual system in mine with no mufflers, and it has a great deep tone, but I'd like to hear what true dual straight pipes would sound like.
5th Wheeling
Joined: Mar 2004
Posts: 41
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I don't really have a way to get a good sound clip, the best analogy I can come up with is a boat with dump exhaust. It is pretty loud when you first start it or when you get on it; however it is a very clean engine sound. No cracky or snappyness like a glass pack.
I don't know exactly what you mean by a "x type" but I'm guessing we have the same setup. I can't even remember right off hand, but I believe the pipes come off the manifolds, through the cats, join to one briefly just before where the muffler was and then they split it back to duals in the rear.
I don't know exactly what you mean by a "x type" but I'm guessing we have the same setup. I can't even remember right off hand, but I believe the pipes come off the manifolds, through the cats, join to one briefly just before where the muffler was and then they split it back to duals in the rear.
Post Fiend
Joined: Jan 1997
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From: Enjoying the real world.
I've never understood straight-piping a street truck. Its just as inconsiderate as those inner city punks who put whistlers in their tailpipe. They think it sounds cool and to hell with whoever it disturbs when they drive by. Loud doesn't mean power, it just means you're being inconsiderate -- and whether or not you know it most people think the same thing about it when pulling up unless you have a true hotrod instead of the "Alabama Sport" upgrade. They don't think "that's cool".