If you want to buy a BS map they do give more power but I'd be worried about damage to the rest of the car. The ecu is the easiest part to deal with if it goes wrong, it can either be reflashed with the original file or replaced but who's going to guarantee the turbo, injectors, pistons etc?
That's the real issue, injectors out of balance, turbo pushing harder than it should, pistons can easily get damaged by bad fueling. People think because there's more power then the map is decent but you only need to shove more fuel in and add a bit of boost to clean up the burn to get a power hit.
Also considering this is in the
Mk4 ibiza section the car can't be that bad? Must still be worth a few quid at that age?
With that said though the mpps cable works a treat.