2.8 kb with 3.0 pulley, what belt?

[Leonard 95]

I purchased a used 2.8 kb not to long ago. It was a 2.8 super snake with 3.5 pulley, I swapped pullies and put a 3.0 on it. I still used the belt that was used with the 3.5 pulley. Right now when I actually look at boost gauge it showing 14lbs, so thinking I got some belt slip. Wondering if I need to use different belt length or maybe just install new belt. Thanks for the help!

 

[niceguyyy01]

It shows in their instructions you have to use the 90mm idler and the 86.4 belt. It says you can use the stock idler with the stock belt on the 2.75 and 2.5 pulleys only.

I just got an 86.4 belt and 3" pulley from KB. The belt was like 75 bucks I think.