Is there a 17% pulley that will bolt onto ALTA's 4-bolt collet? All the 17s I've seen are of the 6-bolt variety..

 

I couldn't find one either.There is no need to keep the 4-bolt collect. Once the original pulley is removed, the hard part is over. The Alta collect will come off when you remove the bolts. It may stick a little. I replaced mine 15% Alta with a 17% clamp on from Helix. http://www.helix13.com/html/products...w.php?p=intake

Nice upgrade!

 

My thought was to keep the Alta collet & save a dollar or two.