Was that on standard-height suspension though? As I said though, it depends mainly on your offset and the load you place on the car (a full car adds 30% more weight to the car for instance). Getting the speedo recalibrated may correct the difference, but it will cost you money and getting the right tyres is a better idea, considering those 205/45/17s will be reading under by more than 5% (ie really doing 105 when the speedo says 100), as opposed to 205/40/17s which are only 2.2% over. Golden rule of working on cars is to never compromise simply because you have something laying around or are getting it for free - I'm having that issue with the Celica now with the tyres being too big. Actually its the other way around - the series 1 ('94 to '96 I think) has no centre garnish on the rear of the hatch (sedans have the grey panel) whilst the series 2 has the centre garnish (and series 2 sedans have the red and orange panel). The panel is removable in the sense that you can take it off and replace it (should be some bolts/clips on the inside of the hatch behind a trim panel), but if you take it off and leave it bare then it won't look right (holes etc)