99s have drive by wire electronic throttle, variable valve

timing (I think) and side air bags that also protect the head.

The 98s can be chipped (since they don't have electronic throttles)

easier then the 99s -- in case you want more power.

I don't recall an aluminum trim option in 98.

Options were, just from memory, leather, automatic transmission,

cold weather package, wood trim (about $500). There may have been

a radio package, too. Note I purchased my 98 T5 in April of 97

so more options may have been added at a later date. Maybe

tou have an early brochure.