Yeah its 13%, I don't want to go above that until I get a better (prob aGP) intercooler as you will prob lose power at the top of the rev range due to the extra heat, like having an open cone induction kit. The guy I got it off make some oem pulleys for other companies. Its a two piece one so if I want to go for a bigger or lower reduction I only have to order the outer piece. ( I would have just bought a 15% off Ger as if you're leaving it at that then no point a brand name inside the engine)
The other reason I got a 13% is because once you hit 15% you're at the stage where the supercharger starts to wear quicker. I'll be upgrading that to the teflon coated one at some stage.
There was a reason that JCW only did an 11% reduction, heat generation and wear on the supercharger.
Here's a link to the KAVS website if anyone is interested
http://www.kavsmotorsport.com/index.php
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