Performance Software/CHIPS
 

I picked up a copy of excellence, and saw a number of ads for "performance software/chips" ads in the magazine.

One is Revo Technik, another Powerchip and so on.

Are they worth putting on? Do they in any way invalidate the warranty or decrease the reliability of my engine?

I've got a 2007 Boxster S, and the available power is GREAT, but, if I could add a little more horsepower, well, you know...

Thanks,
Michael