Hey guys, thanks for reading!

I've been looking at NB Miatas for a while, and before I buy want to know if there are any years to go after (or avoid)

My biggest question is with the variable valve timing engine: I've heard that it was supposed to be 155 hp, but that some last minute detuning for emissions (thank you state of California emissions) made it 142 hp. Is there a way to "chip tune" it to get the extra hp? Usually chip tuning is not really worth it - more peak hp, but less usable, less torque, etc, but if you could figure out the "original" specs it should theoretically be a "no compromise" boost. Is the variable valve timing engine worth it otherwise? Any other advantages? Any reliability issues with either engine?

Any other equipment to look for (or avoid?)

Thanks in advance for you help?