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I have an aftermarket exhaust (and nothing else) installed on my 512TR which apparently gives the car an extra 12 to 15 BHP, bringing it up to the same horsepower level as a 512M. Would it give me slight improvement on the 0-60MPH time and topend speed? Also, because the BHP is now the same as the 512M, will it have the same 0-60 time as that car?
 

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Depends on the torque-curve (ie, have you only got extra top-end, or some extra bottom-grunt as well), plus car weight, gearing incl tyre-size, and aerodynamics.

My guess without knowing the differences between the cars is that they would be similar.
 

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Additional bhp will certainly increase the top speed. But increase in bhp does not necessarily increase torque which will increase accelerartion. As 4kids3fish said, look at the torque curve.
 

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Also weight will be an issue, and the grip improvement between the 512 TR and F512M. For acceleration torque is most important, for topspeed bhp is.
 
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