GENERALLY – chips are considered a bad idea, whereas a custom re-map is considered a better solution…
Have a look at:
Jabba Motorsport
P-Torque
Custom Code
Revo
Will at P-Torque always gets a good mention on the SeatCupra.net forum for remapping various cars – mainly the 1.9TDi when talking about diesels though.
I think you can expect to get the 100bhp version up to about 130bhp.
The 130bhp will go up to 170 with no bother (apparently), but take it much higher and you get issues with the intercooler being too small (side mounted, instead of the large front mounted versions) and you also start getting close to the limits of the clutch.
I looked into getting one when I first bought my car (Ibiza 130 TDi) but was concerned that I’d then have to fork out for an uprated clutch (something like a Sachs @ £500 or more) and didn’t really want to find out if it ruined my fuel economy. Many people reckon it improves the fuel economy, but I find it hard to believe……