Yup those are 40's. Exhaust will always sound better when you put load on the engine(driving away) 
I ditched the flows w/ o/r x a long time ago, but it brings back memories.
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99' Rio Red Mustang GT:
Summit O/R H, MAC Flowpaths w/Turndowns, BBK Shorty Headers, Steeda UDP, K&N intake, MGW STS, Diablosport Delta chip, BBK 75mm throttle body, Trickflow upper plenum, H&R SS springs, Cross drilled & slotted rotors, "Functional" hood scoop
Life= eat, lift, eat, eat, eat, sleep, repeat 
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