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The pulley for the head unit states its size on it and should be 3.33 for 5-6 psi the crank pulley is 6.87 They told me to run 10# i needed the 3.12
 

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My setup is for under drive dont know if that matters as far as the head unit pulley. They acted like it did but from what i see on there website it doesnt.
 

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measure the outside diameter. subtract 1/4" that will be whaqt you have. The crank pullies are all 6.87. They told me to run 10-12# i needed the 3.12 pulley. If you got a 2.6 pulley thats way too much boost that will be like 18# buy the limit valve see if it works.
 

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Yep thats way more boost than you can run, its the smallest pulley they make, try the limit valve. I was going to. If you dont want to let me know ill buy the pulley if its an 8 rib.
 
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