Okay...i finnaly found an Si tranny to replace my HF one (which is the origlinal from 126kmi back). i was wondering if the new tranny would change the speedometer accuracy. also, im going to be getting 15in rims. would the combination of the two totally f**k up the accuracy? any help is apprecieated. Thnx

 

the trans wont wheels may theres a really nice link i had @ a miata site that let you put in stock vs new wheel sand tire sizes and shows you how much speedo will be off lemie look for it

 

http://www.miata.net/garage/tirecalc.html