03 MUSTANG GT,4R75W KENNE BELL 2.1 S/C NON-INTERCOOLED 6PSI
36LB INJECTORS,MONO CHIP,AUTOLITE 103s
BOOST-A-PUMP,SLP LOUDMOUTH CAT-BACK
TRICKFLOW 70MM THROTTLE BODY
STOCK AIR INTAKE WITH K&N DROP IN
FORD RACING 3.73 GEARS
B sounds better on the computer, but you really need to drive/ride in cars with different setups at different speeds, engine loads, etc. I loved my flowmasters when I first put them on, but until I installed 373 gears, they would drone on the interstate at ~70mph. It was cool at first but annoying on a 5 hour drive.
My point is don't just go by what it sounds like online, go see for yourself or you could regret it later.
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"Ignore that whistle, it's just a vacuum leak."
2000 Mustang GT:
Saleen Series IV Twin Screw, Chicane I/C, AFCO Extreme H/E, 2.8" pulley, FMS 42# injectors, Dual Catted 2 1/2" UPR X Pipe, UPR LCAs/UCAs, 2 1/2" Flowmaster American Thunder kit, 90mm LMAF, 112" Goodyear Gatorback, Kenne Bell BAP, Mosaleen idler, T-56, Detroit TrueTrac w/ 373s, Demolet 100mm CAI, SCT XCal2 with JDM Engineering 93 Octane "Race" tune.
I heard a GT at union hill dragstrip in Nashville once that had shorty headers slp catted x pipe and a LMII catback that sounded awesome and it had no drone. I love my flows and O/R prochamber, but it drones. I would go borla over LMI but you might want to look into the LMII
Magnapacks are awesome too.
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Current mods: Flowmaster 40s, O/R Prochamber, K&N filter, Proffesional products 75mm plenum, diablosport tune, 3.73s, MGW shifter, Fidanza 2.1 clutch, Roush lower control arms, 17x9 GT500 wheels, 2003 Cobra bumper, 10th anniversary Cobra brake kit, white face gauges, 8 in. shorty antenna, bumper letter inserts, 4.6L V8 hood scoop decals, XM radio,
Next mods:
MM panhard bar, V3-Si Vortech, Comp XE270AH cams
Exhaust Choice. YOU PICK! 
