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I know this is the SRT-4 section but I figure I'll share my fastest experience. I accelerated to about 155 mph and let off. As soon as I hit 155 mph the car finally switched from 4th gear to 5th gear. BMWs, Mercedes, etc. have limiters on them and the 540i's kick in right around that speed. I did this in my moms 00' BMW 540i. That's the fastest it's been since we got it brand new.[X(]