i have a mk3 si with a 2.0 conversion.

In mk3 shape there is two types of si one is a 1.4 which is crap and one is 1.6 16v zetec engined one. The zetec engine is much better than the other one, the 1.6 has the better winged seats. Most have electric packs but not all.

The good thing about them is an rs1800 slots straight in which is what i did for awhile and with a tiny bit of messig about a 2.0 will go in aswell. any other q's just ask