i dont know mate to be honest but if you dont live too far away from me you could have a look over my mk5 rs2000

the 105 xr3i used a different gearbox to the 130xr3i and the rs2k so i would change that too but i cant see the conversion being that bad.....

the 130 xr3i zetec engine is just as fast as the rs2k one and upgrading your 105 to 130 spec would be an easier option if more speed/power is your reason

i`ve had 2 130 xr3i`s and i have a mk5 rs2k now and i`d say they arent that far apart performance wise