GSR helped tune up the RED-DOT deisel punto and that was running silly amounts of power and kill's the highly modified GT's.

They have a specific induction kit too using the CDA, GSR F19i. Offer a lot of maps and other bits and pieces. I'm sure there is a list on one of the forums, think its punto mk2., but they offer lots of different packages, ranging from a few £££ to ££££'s.