May 21, 2005I don't know anything about F150 exhausts, but why in the heck do they have four cats?!?!?
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May 21, 2005I also have the flowmaster 40 single in, duel out, 4.6 engine. It has gotten louder as time goes on. I like it. Check out the pics in my galley to see the excellent job the guy did installing it. Very pleased. It's my favorite mod.
May 21, 2005im soooooo confused after this post. i thought that the whole point of getting dual was for it to be louder?! and, well, for looks, obviously. with the imco as many of you are suggesting, will i want to do turndowns, or run it out the back to try to take some of the sound out of the cab? basically, i want the sound first (quality of sound comes before the loudness). I want the deep, strong sound. if it's gonna be soo loud that i have to run it out the back, then i'm gonna want duals for the looks.
thanks so much for yall's hlep, im confused, but at least im learning something
May 21, 2005You exhaust guy has his head so far up his ass he can't see the light of day.
May 22, 2005flowmaster,single in ,duel out the back......................
May 22, 2005whatever you do dont get glasspacks, i have a glasspack on mine and as soon as i got it i had a noticeable loss in power and it sounds like crap now, getting ready to put an imco 1 chamber on.
May 22, 2005Your exhaust guy is a freakin moron. Yes your truck has 4 cats but that is not relevant.If you are looking for a nice mellow yet strong tone in your exhaust note stick with one of the Cat Back systems Borla or Magnaflow. Or simply get a single in dual out muffler and and dump it right at the muffler with down turn tips about 5 inches long. Glassspacks will sound like crap. As for mufflers a Borla,Magnaflow or even a Delta series Flow would be ok. I personally do not like Flowcrap but that is just me.Magnaflow makes a very nice 3" system that sounds very nice.
Daaver not sure why the 150's have 4 cats I removed all 4 of mine and stuck two high flows on and the readings in the smog test stayed the same. Most likely it is a Federal gov thing.
May 22, 2005glasspacks dont belong on modern trucks.. I question their use on vehicles from the 80s.. I make fun of people who have them on vehicles from the 90s on up.. please dont go that route..
go with the flowmasters..
May 22, 2005You're truck does indeed have 4 catalytic convertors. Here's how the setup works:
First comes the front 02 sensor. Then it flows into a single screened cat. After that there is a dual screened cat with an O2 sensor built into the middle, between the 2 screens. After that, the 2 pipes converge into one pipe right before the stock muffler. Then after the stock muffler, the piping flows out to the back, behind the tire. I've included a picture of the 4 cats that I had taken off of my truck. Notice the O2 plug in the middle of the second cat.
Now this is the way I have my exhaust setup on my 03 4.6. I have a pair of Magnaflow Hi-Flow Cats installed after the first O2 sensors. Then I have the second set of O2 sensors installed about an inch after the Hi-Flow Cats. Basically I had all the stock cats removed and a pair of Hi-Flow Cats put in their place. I didn't touch any of the piping between the cats and the muffler. That stayed the same. I had the stock muffler removed and in it's place, I had a Magnaflow SI/DO muffler installed with the dual pipes exiting out the rear of the truck. For what you're looking for, this is about the best setup. Yeah, you can get an X-Pipe and dual mufflers installed, but you're not going to get any increase in sound or performance this way. You're just spending a lot more money than you need to. If you've got any questions, email me and I'll clear up any questions you might have.
May 22, 2005Actually his second cat does NOT have the O2 in it like that. It is located after the cat past the cat itself.
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