Unless you have a forced induction engine that electronically controls boost, a ECU flash will do VERY little. Especially a factory approved flash. Perhaps 10 to 15 HP at the flywheel at best. Forced induction cars only get such a boost because, welll...it ups the BOOST. Sporty is a term that gets applied to average cars to make them seem like sports cars. A car can be fun to drive, yet still slow as can be. My 93 Escort was that way. It was fun to flick it into a corner, get the tail to slide out a bit. But the stupid thing could still only do a 19.1 @ 71mph. Yes, this is verified, it was THAT slow. Slow enough that I could possibly lose a drag race against a Hummer H2.