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The under-drive pulleys come in different sizes, so the smaller the diameter the slower the accessories turn.
I use a Tarret UDP and I think it was 4" diameter and it moves the accessories fast enough that you still get air conditioning at idle.
You also need the right size replacement belt to go with it, which the Tarret also came with.
Light weight fly wheel is good for racing but there is some talk of it not being adequate and the possibility of over stressing the Piston rod bolts if I recall correctly and the potential engine disaster that occurs when they let go.
Probably not worth the risk unless your racing.
The 2nd CAT deletes are awesome and an after market muffler saves weight and can improve the exhaust note some.
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"It broke because it wants to be Upgraded  "
2012 Porsche Performance Driving School - SanDiego region
2001 Boxster S, Top Speed muffler, (Fred's) Mini Morimotto Projectors, Tarret UDP,
Short Shifter, Touch Screen Dual Din Radio, 03 4 Bow glass Top (DD & Auto-X since May 17,2012)
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