You wanna talk to Mr Mick Abbey, vendor of fine, made to spec son-of-a-byatch spannies for RD's per-say, RG400/500/RGV500 etc..etc..etc...

Good for just under 60Nm's of torque from a well sorted YPVS - nearly as much as a stok RG500

Cheap and flippin' good pipes - when he has the time to make them hat is... kinda exclusive
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These aren't the droids you're looking for.