I installed a check valve between my PVC and intake manni.
Made a world of difference in spoolup and eliminated a massive boost leak.
(also helps with blowby)
I bought one of these a couple years ago:
http://www.usplastic.com/catalog/pro...uct%5Fid=15641
made all of the difference.
They have these now, pretty damn cool:
http://www.usplastic.com/catalog/pro...oduct_id=20411
if thats the size you need.