Mr bill advises that he would only put throttle bodies on a car that "needs to breath more". 0_o . I think they would be the last thing to do to your car, after the fore mentioned chassis upgrades (strut braces, arb's, poly utherine bushes, maybe a bit of seem welding), suspension upgrade, brake upgrade, proper wheels + tyres? and then a bit of tinkering with the engine. You have got the suspension and engine tinkering. SO its just a matter of the other bits. I dont think anyone on this forum actually has Throttle bodies on a
Ibiza, they all seem to be on cordoba's.