Exhaust help
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Exhaust help
I've got a 99 5.4 and true duals and i have noticed a torque loss and was wanting to regain some of that torque. i want a nice deep tone that has a little rumble to it. Any advice i'm thinking Flowmaster Super 40 DI/DO, but i'm not sure i could go with a Magnaflow. If i do teh flowmaster is DI/DO going to regain torque or do i need to go SI/DO??
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From: Durant, OK (SOSU)
With true duals, 2.5" is too big, you need smaller than that to keep your torque, plus a an H-pipe to even things out.
If you want to go muffler, I'd suggest headers to a Y-pipe, SI/DO muffler, dump it or run it to the back as you see fit.
If you want to go muffler, I'd suggest headers to a Y-pipe, SI/DO muffler, dump it or run it to the back as you see fit.
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From: Rio Rancho USA
Did you reset the PCM? Where are your o2 sensors and are you running MIL eliminators? What did you do with your cats?
With the bigger pipe, midrange torque will be boosted, enough sometimes for someone to think low end is gone since it will pull harder at higher RPMs.
With the bigger pipe, midrange torque will be boosted, enough sometimes for someone to think low end is gone since it will pull harder at higher RPMs.
Last edited by kens64; Sep 4, 2006 at 02:57 PM.
Post Fiend
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From: Durant, OK (SOSU)
The Flowmaster 40 series, as widespread as it is, is a good muffler. If you want a good loud rumble, that's the way to go. For just a rumble, run the pipes after the muffler out the back of the truck. For a loud rumble, dump it right after the muffler.
I'd suggest a single-in dual out.
I'd suggest a single-in dual out.
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Posting Guru
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From: Prince George, B.C.
Dual in dual out Magnaflow should do the trick, you could get 2.25" tails put on after the mufflers. Go with an 18" body length.
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Dual out on a Flowmaster 40 close after the muffler will definitely give the deep rumble:
Some other options are listed here:
http://motorhaven.autoanything.com/exhausts-mufflers/20A50460A1.aspx?kc=MOTORH
Some other options are listed here:
http://motorhaven.autoanything.com/exhausts-mufflers/20A50460A1.aspx?kc=MOTORH
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Joined: Sep 2004
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From: Fort Payne, Alabama
I have heard that simply adding a X-Pipe to a true dual system will really help with low end power and torque, I heard this from a guy on the forum. He has straights with stock cats, true duals, and a x pipe. He said he once had true duals with no linkage inbetween, and when he added the x pipe it was a huge difference, really helped the scavenging of the exhaust. I personally have a 4.6L with high flow cats, 2.5" true dual straights(no linkage whatsoever), angled out the back with 5X22" SS tips, I did notice a big drop in low end, but gained a lot at around 2000 and up. Just a lil info I thought might be somewhat useful.
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From: Prince George, B.C.
The main reason you noticed the loss was because you went with 2.5" pipes, if you add an X then yes it will help. But you wouldn't have noticed it as much if at all if you had gone with 2.25", tune the exhaust and it makes a big difference as well.
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