Corsa-B.uk - Vauxhall, Opel and Holden Corsa B Owners Club

hi, just want some opinions on this chip around a modded x14xe. do people think it will work good with a already modded engine? got powerbox, 4 branch, k&n n catback exhaust system atm. thanks http://cgi.ebay.co.uk/OPEL-VAUXHALL-Cor ... 3058373324

Seems a bit too good to be true, I cant see that it would increase performace and up your bhp as well as making the car more fuel efficiant