Grey top - Silver Top. Difference?

[steev911]

What differences are there between the 90bhp grey top VTR engine and the 98bhp silver top VTR engine?

Had a search but could not find the answer!

What i really mean is...

Can you make a GT 98bhp by putting any ST bits on it?

[Mark51]

WTF?

GT and ST?

if your on about the 90bhp and 98bhp vtr engines, which i think you are then this was covered a couple of days ago so SEARCH.