The highest speed I've reached so far in the SRT4 is 239mph. I've been in a quest for a while to make it hit 240mph, or above. Anyone care to help? By the way, the REAL SRT4 was able to hit 221mph, making it the world's fastest 4-cylinder. I don't think there are many that can break the 200mph mark. maybe the Impreza and Lancer and some Porsches, but not many.