if there are any concerns with under driven pulleys just go lightened. Pretty sure NRG/MRT etc sell them. Ensures you can stay with oem or other goodies like gates timing belts... http://www.gatesaustralia.com.au/

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Speak to Shane @ SMC Tyres, Unit 6/385 Sevenoaks St Beckenham WA 6107. Mobile 0413 128 087. Tell him Maddog sent you!