I am currently running a 2 chamber flowmaster with a turndown in front of the rear end. I am considering upgrading to true duels and have both flowmasters turndown in front of the rear end as my 1 muffler currently is. How much difference in sound would there be, and would this be worth doing? Also, should I leave the cats alone or remove them? thanks

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Matthew L.
2000 F150 Sport
4.6L
Flowmaster exhaust
Billet everywhere
Front clear lenses
double 5% tint on sides and rear

 

I have true dual turned down flows on mine. Ive got mine ran right off the headers and cats. all they did was cut off the factory y pipe and run pipe right where the y turned for the drivers side. the passenger side is straight back. they are welded together. i had a single turned down for a while and i love my true dual setup . there is more of a growl, but now too loud like straight pipes. you would really like the two turned down setup in my mind

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1997 Lairat reg cab, true dual exhuast with 40 series flowmasters, jet power module( soon to be superchip) k&n, b&m electronic shift improver, pacesetter headers, airraid throttle body spacer.
running 9.67 in 1/8