Hi,
I have a 2002 WRX with AEM cold air intake, and a Blitz catback exhaust. I was wondering if the Turbo XS chip is worth the 700 dollars, and if it will create a substantial difference in my cars performance.
I would be greatful for any advice that can be provided.

Go for the EcuTek remap

I say UTEC.

don't buy the unichip for 700 if that's what your talking about, you can get these for 350-400 on ebay or in the private classifieds. If you want plug and play get the ecutec or a used unichip if you want adjustability and you like to play(and are willing to learn) get a UTEC. I'm very happy with my UTEC BTW, but Ilike playing with it.-James