car is 03 GTP, mods are:
3.4 Pulley
1.95 Yella Terra Roller Rockers
LS6 Valve Springs/Pushrods
Powerlog/ 3" Downpipe/ Magnaflow Cat
Magnaflow Catback
K&N Intake
Overkill 4.2 Tune
getting tuned at ESP Tuning in Sterling, MA
93 octane
what is YOUR guess? keep in mind it is a Mustang dyno
the car ran a 13.8 2.1 60 ft on street tires