yesh very funny
In all seriousness we need to know the engine your talking about, if your thinking of a gti engine in whatever form i would imagine the 1.4 box and clutch would need to be replaced with a gti box/clutch
You best bet would to buy a body buggerd gti and get the engine, gearbox, clutch, loom and ecu and transplant the whole lot into your car
Or better still buy a gti, unless you are trying to to the same as Joe with a 5 door gti
If you talking about a different engine from a different car, you would take all the gubins from that and put in your MERA
Hope this helps Matt