Quote:
Originally Posted by Chewie4299
The manufacturers needs to please many people/organizations/governments.
The tuner's job is to please you.
Have you ever seen a radar graph?
Imagine you can only fill so much of this graph. In one direction you have fuel economy, in another you have power, in another you have emissions, and so on and so forth. The manufacturer is going to spread their butter real thin in every direction. Power won't be where it could be. Emissions won't be where it could be. I think you get it by now.
The aftermarket tuner has far fewer people to please and can specialize how the engine does its work and put all the jelly on your piece of toast.
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Actually, I think OEMs typically put everything into emissions and spread it out thin everywhere else, because emissions regulations are really really hard to hit :P Emissions compliance ruins just about everything else, although we have it to thank for electronic fuel injection (that's about it).
A tune can't really decrease fuel economy because cars run really rich from the factory to protect cats.