Hey guys. Picked up a GLA250 recently and am very happy with the car. While I love the 45, I really don't need the bigger rims with the road conditions here, and I'll never get to use the brakes and suspension the way they were meant to be used. I do however desire the engine performance. What are the differences mechanically between the 45 and the 250 drivetrains? I've done research on the different CPU upgrades available, and intake and exhaust, but they still don't seem to add up to the 45's hp and tq numbers. What am I missing?