I stopped by a custom exhaust shop to talk about installing a cat back true dual exhaust on my 6.2L Raptor. He suggested using a MagnaFlow Tru-X 18" DI/DO muffler with a built-in X-Pipe instead of two 11" MagnaFlow SI/SO's with an X-Pipe near the front. The price for the DI/DO setup is cheaper by a couple hundred dollars, so he was not trying to sell me on the more expensive option.

I always heard the X-pipe should be as close to the front as possible for back pressure and the muffler(s) should be as far back as possible to reduce the drone in the cab. Have things changed with the new engines?

Does it make sense to have the X-Pipe in the muffler further to the back?

Do you think a single 18" DI/DO muffler will be louder than two SI/SO 11" mufflers?

Thanks,

KR-Texas

 

Nobody has any ideas?

Has anyone tried any of the DO/DI with with built-in X-Pipe mufflers? (Flo-Pro, FlowMaster, MagnaFlow, etc.) Can they be used in a true dual setup instead of a real X-Pipe and dual mufflers with the same performance characteristics? (ie. The same HP gains, no loss of low-end torque, etc.)

Thanks,

KR-Texas

PS. Any ideas Darren? I know you have an opinion...

 

I have a magnaflow DI/DO with the built in x-pipe and let me tell you, this is the way to go. You'll really notice a big increase of top end power. The muffler itself is a little heavy, but it is well worth the money and it fits perfectly where the original muffler was. It sounds great, the only time you hear noise in the cab is around 40mph but it may be different on mine due to my longtube headers.

 

DIDO Magnaflows with a built in X-pipe are a good way to keep costs down while still having the same power and good sound, more or less.

I personally think that they don't sound as good as a system with a pair of mufflers and a standalone X-pipe, but they still sound better than 90% of cat-backs.

The power and torque curve might be a little bit different between the DIDO and traditional true dual exhaust, but I doubt you would ever be able to feel it.

 

I have the magnaflow part# 11379 its a dual in/out muffler but the body is 11" it doesn't have a internal x pipe its a straight thru design but im running a x pipe as close to the motor as I could get it I love the sound but I kinda wish I would have went with the magnapacks just to let my cams talk a little louder.

 

Thanks for the feedback. I guess I should have read your excellent sticky post before I made the mis-guided comment about back pressure...

I have had true duals, with X-Pipes and two Magnaflow mufflers on my last two trucks, so I know they sound good on the 5.4L. I hope they sound the same or better with the 6.2L, but now I have a cheaper option to consider. I am going to hide the tail pipes with just the edge of tips showing because I have grown tired of the big tail pipe look on the back of my truck.

I will post some pictures when it is all done.

KR-Texas

 

One more quick question. Are there any drawbacks to using a standalone X-Pipe near the front and the DI/DO Tru-X muffler as far back as possible? (Sort of like a double X or X and H setup)

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I like the idea of having the DI/DO muffler sideways tucked up under the truck versus running the two shorter mufflers side by side on their ends. If there is no difference performance and sound wise, I may ask the shop to give it a try. (I imagine a singe 18" muffler will be slightly louder than two 11" mufflers)

Thanks,

KR-Texas

 

When I was trying to decide on what to run on my truck I was talking with magnaflow about running a x pipe with a internal x pipe muffler they said it would be a little quieter

 

Magnaflow part# 11379 dual in/out 11" body far back as possible, x pipe as close to the motor as possible.
http://www.youtube.com/watch?feature...&v=tAGidBeHYmY
http://www.youtube.com/watch?feature...&v=AKr4BVNlAnQ
http://www.youtube.com/watch?feature...&v=DUhuEGcX4WU

 

My bad on being late, not that i'm losing interest, just too busy anymore.

Answer is self explanatory, your best bet for the best performance is to keep the X pipe up front and dual mufflers. But a cost effective way the DI/DO will be ok.

 

Do you see any issues or disadvantages to the double X approach? (X-pipe up front and the MagnaFlow Tru-X muffler in the back) I want to keep the exhaust tucked up under the truck as far as possible, so the DI/DO in the normal horizontal position is an interesting idea.

=x====[x]===8

Thanks,

KR-Texas

 

I ran x pipe with dual maggies, then just di do maggie with xpipe. My butt dyno noticed zero difference. couldnt tell you about sound because I went long tubes when I did the di do maggie.

 

It will choke it down with two X pipes.

 

^ An X pipe only needs to do it's job once, and it does it very well.