Never knew that about the TDI badges, but as the others say, the colour of the 'i' on the petrols doesn't mean jack. My 2000 turbo's is all silver. My mates 99 had a red i. From behind, another, (but not definite) way of telling a 1.8T from a 1.8/2.0, is the fact that the T's had centre rear headrests fitted as standard.