you could try gears for a gearkit , they are making thier own semi-helical big tooth kit
i'm testing a proto type for them in my mk3 fiesta track car with frs engine
not had one problem with it and it gets death all the time , sounds like this -

http://www.youtube.com/watch?v=8x7nY1gVPmU

or this

http://www.youtube.com/watch?v=MnOTtxqKjzM


WWW.GEARS.TV

if you phone ask for peter