Which Pulley Kit should I buy for my M5? - Page 2 - BMW M5 Forum and M6 Forums
E60 M5 and E61 M5 Touring Discussion 2005- Advertiser's Forum

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post #11 of 13 Old 28th August 2015, 02:17 PM
Bimmerzone.com
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Eloy said it all

Go with RPI


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Originally Posted by RPIpower View Post
The underdrive percentages are different. Some of the companies also have different types of anodizing so it really depends on what you want. Some are imported from Asia and some are made here in machine shops. Our pulley is a just a tad over 16% of an underdrive compared to stock. Some of the other brands will underdrive up to 30%. Some of the pullies have regular anodizing and some are hard anodized so again, it really depends on you and what you want in the parts you are putting in your car.
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post #12 of 13 Old 28th August 2015, 03:32 PM
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damnit agency power is like 300 on eBay and they wouldn't accept my lower offer of 195 like they used to sell it!
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post #13 of 13 Old 28th August 2015, 11:05 PM
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i don't see that much advantage in the pulley as the original one is so light also made by aluminum and the racing pulley just bit smaller so the real benefit is not worth.also the water pump & the steering will not be working as like the original at idle speed .

i have used power agency and i did't felt the racing pulley worth the Gain. its better to do Cats delete , high flow filters & tune. or just go directly for supercharge without wasting ur money

Last edited by maxspeed; 28th August 2015 at 11:07 PM.
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