Originally Posted by besiktas
I really doubt that you can add an extra 100hp by chip. If it was true, and that simple, bmw would have done it long before.
The reason why the 63's were able to get that much bump is that the motor is detuned from factory. It's the same 63 engines in the E class that makes 500 at the crank, so a simple tune would have boosted it up to ~520 at the crank, which means the tune only provided about ~15 hp gain the crank compared to the "standard" output of the 63 engine.