Mazda Mx5 Diff option

This would require two custom driveshafts and could have packaging issues.

It is helped however by allowing a higher ratio if a toothed belt drive is used as well.

this link shows a good image of the diff
http://www.google.com.au/imgres?imgurl=http://www.mx5parts.co.uk/images/si2999.jpg&imgrefurl=http://www.mx5parts.co.uk/product_info.php/products_id/1654&usg=__61qnrl4MxN6DlBN6Y_J26K6dBy4=&h=413&w=550&sz=41&hl=en&start=4&zoom=1&um=1&itbs=1&tbnid=QLdHnhjs-bnnfM:&tbnh=100&tbnw=133&prev=/images%3Fq%3Dmazda%2Bmx5%2Bdifferential%26um%3D1%26hl%3Den%26sa%3DN%26tbs%3Disch:1

http://www.miata.net/garage/diffguide/11.jpg

the link above shows that it may not work as there is no inner cv joint

you can get a torsen diff for a miata

http://www.google.com.au/imgres?imgurl=http://memimage.cardomain.com/ride_images/1/557/3141/1391570086_large.jpg&imgrefurl=http://www.cardomain.com/ride/139157/2&usg=__m1sDf7M1VRikNw49Zzm8UNuJvGw=&h=383&w=575&sz=40&hl=en&start=36&zoom=1&um=1&itbs=1&tbnid=FiVfw8FWIhOroM:&tbnh=89&tbnw=134&prev=/images%3Fq%3Dmazda%2Bmiata%2Bdifferential%26start%3D20%26um%3D1%26hl%3Den%26sa%3DN%26ndsp%3D20%26tbs%3Disch:1 



this must be some of the best ratio data available.

http://www.miata.net/garage/KnowYourCar/S8_Gears.html