Do you both have same transmission type, same trim level?
Same wheels and tires?
Same amount of wear on the tires?
Were the tires on each vehicle inflated to the exact same PSI?
Did your friend have an oil/spark plug/air filter change recently and you didn't?
Were the oil and coolant temperatures the same on each vehicle during those runs?
Was the ambient temperature/humidity/barometric pressure exactly the same when each car was run?
Did they strap down the cars to exactly the same tension?
Lots of **** can cause a difference in dyno reading, I wouldn't sweat it too much.
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PPE Headers SS/Coated/Wrapped | Ebay y-pipe | Custom 3" single exhaust w/ Magnaflows | UpRev | Racingbrake 2pc Rotors | 40th calipers | Eibach sways | SPL endlinks, diff mounts | RJM pedal | Stillen Intakes, UDP, Flywheel | M370 Manifold | Z1 engine mounts, CSC-EK, Clutch | Forgestar F14 18x10 | Conti DWs | Quaife diff/4.08 gears | Nismo diff cover
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