who makes the best dual in dual out muffler? i have a dynomax ultraflow x dual in dual out on my 03 f150, 5.4, but its already starting to rust out. i doubt it will last much longer. so i'm not too happy with dynomax.

 

Very happy with my Magnaflow DI/DO muffler, it has the Tru-x core as well. I went with the 11" model. Shouldn't have the same problems rusting out since it's stainless.

Check out my thread for pics and video clips: https://www.f150online.com/forums/ex...tem-again.html

 

The Magnaflow DIDO muffler is pretty good, but a stand alone X-pipe near where the OEM Y-pipe was, will perform slightly better.

 

yes, but thats a big price difference

 

Magnaflow & Borla do. Mag is t-409 stainless, Borla is t-304. Borla will outlast anything.

 

you get what you pay for

 

um...ok

 

It is true, an X pipe located as close to the original Y area, with true dual ( actual dual mufflers ) will out-perform a internally X'd muffler any day. The X pipe is just too far back when its inside the muffler to perform right.

 

i know that. just the comment he made didnt make sense.

 

NacsMXer has your DIDO 11" magnaflow sound volume wise, i just have a 40 series flowmaster. Its an improvement over stock but wasnt too impressed with it.

 

get what you pay for?lol,i got a sido thrush!may only last a couple yrs but for 30 bucks its still a bargain,and i love the sound!

 

i thought 11" dido maggies were not x piped inside due to be so short?

 

it was on the price for performance

 

x2. Their X pipes are made of 12" long bodies, guess they downsized it to fit in the 11" case.

And, the longer lifespan of the system ith stainless piping.

 

move to the south and dont worry about needing stainless steel