I am running the Revo install. The "chiped" ECU your talking about is probably just a software refash of your stock ECU. I know that Reeves Motorsports of Tampa, does the reflash for a good price. I have it installed on my 01 GTI and I could tell the difference leaving the parking lot. About hit a truck when my car jumped forward much faster then I expected it to do. I was cheesing all the way home. Oh i recommend you install an oil catch can on your EGR return line to your intake. You will get blow by oil and gunk in your MAS if not and I tell you what $60-$300 bucks for a new sensor sucks. I can give you a step by step and some pics if you like.

Good Luck,