Also consider not just the top bhp numbers but how it gets there, the mid range is easy to get power from on those cars, and thats where you drive them most of the time. youre not gonna be using all the bhp of the car much at all unless you are racing it
Most decent re-chips for the 16v will only give 4-6 NHP peak...but are capable of giving 10+ BHP midrange, so they feel faster than the peak power suggests.
But, with all 16v engines, you have to be prepared to use all the revs, all the time.
I hit my 7300PM limiter every day I drive mine...you have to, if you want all the 'go'.