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post #19 of (permalink) Old 08-10-2013
David Young
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Joined: Oct 2012
Location: Clinton
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This is an experiment i did. I have Magnaflow 'street series' axlebacks. They got a little louder with the long tubes and catted x-pipe, so i started wondering how the factory mufflers would sound. I reinstalled the factory mufflers just to see. They sounded good but i lost a lot of low end torque. I put my 'street series' back on. A few months later i bought some Magnaflow 'competition' axle backs, they are 'muffler deletes' (straight pipe). I installed them and i lost low end torque. I reinstalled my 'street series' and my low end torque came back.

I found the fine line between too much back pressure and not enough.
Factory muffler=too much back pressure
Muffler delete=not enough back pressure
Magnaflow 'street series'=Perfect

I'm not a Magnaflow fanboy. This is just how my testing came out with what i had to work with....

'Little Red'. 2011 V-6 Mustang. Automatic <acronym title="transmission">Trans</acronym>. C&L C.A.I. Ceramic Coated BBK Long Tube Headers and Catted Shorty X-Pipe. Magnaflow Street Series Axle Backs. 3.73 rear gears. GT 500 Lower Control Arms. JLT Catch Can. Axle Exchange Aluminum Drive Shaft. Steeda Watts Link. Several more mods...1991 F150 4X4 61,000 miles. Wifes car, 2014 Ford Edge Limited.
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