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AP22 performance meter for £150 ish. It has never been more than 2% wrong on approx 10 cars that I have measured prior to a rolling road run
Even then, it was probably the rolling road result that was innaccurate if the car had a top mount intercooler not being cooled properly.
Could try the Blitz Power ID Meter too.
Bit more expensive than the AP22, but looks very nice and smaller too.
Measures more than BHP, does 0-60, 1/4 mile runs etc etc
jasonwrxowner - I do that as well, very funny isn't it. When the kids shout "go on then, show us how fast it is" from the lights, I pull away really slow