I'm also looking at Gibson -vs- Flowmaster. I called the tech line of both
and asked for real world usable numbers for HP/TQ gains and here is
what I got (if one believes these techs (aka salesmen) aren't inflating
their numbers to make a sale)
Both are 3inch cat-back systems for the 4.7L, single side exhaust:
Gibson = 12HP and 25FT/LB of Torque gain
Flowmaster 40 series Delta Flow = 23HP and 30FT/LB of Torque
(rounding out Flowmasters claim of 8-11% gains)
I'd like to see "Blowmaster's" supporting proof that Flowmaster is the
least flowing performance muffler out there, as it may help in me choice.
BTW, Magnaflow is coming out with a straight through muffler, no baffles,
for the 4.7 QC, but didn't know or wouldn't quote gain numbers.
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