Welcome to the boards mate!
Firstly, I think I speak for all of us when I say "forget the Powerchip - get a new exhaust / headers" :thumbup: You'll find that a Powerchip on it's own is highly unlikely to give you any noticeable gains in performance, and may or may not improve your fuel consumption.
IMO if you are after a performance gain, the first thing to do is ditch the standard restrictive exhaust / headers. These are a source of restriction which should be done before anything else. You will get noticeable and measurable gains by improving the exhaust, unlike just plugging in a Powerchip. Don't believe the hype mate!
As far as chips go, they only really start to come into their own when you've got a good flowing intake and exhaust, because essentially all the chip does is adjust your fuel and ignition parameters. And in this respect, something like a Unichip will generally perform better since it's tuned specifically to your car, in realtime, on a dyno. The Powerchip on the other hand is generally pre-configured, and therefore nowhere near as effective.
Anyhow, I'm sure there'll be some more words from those on here who have had experience with them both!!
