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Discussion Starter #1
4.0 whippel owners

I just bought a 2010 gt 500 with a 4.0 whipple 3.5 pulley if anyone has this set up how much boost are you making with long tube headers .? The factory boost gauge is getting pegged instantly I think I.m going to get a 4.25 pulley but was just wondering
 

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Discussion Starter #3
Thanks called whippel today they said 24lb to 26lb ordered a 4.25 pulley do not want to brake rods lol
 
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