I worked it out that the car cost me approx £50 per horse, so i think buying a chip that can add potentially 10 bhp or more, for £500 is good sense.
I am not an expert, but with exhaust, filter etc...with properly mapped chip, can work out exactly the same price per bhp as the original car.
This is how I justify it anyway. As soon as I can get insured with mods I'm gonna be chucking all my spare cash at my car.
And with depreciation and all that, getting a faster car is not a cheap option when I already have a fast car.
Wasn't there a group buy from GDI a while ago, is that still available?