Yes, the semi-official Charlie Smith spring is a heavier wastegate spring. Charlie has had a couple runs of them made and offered them to turbo owners in this group. Al Powell Voice: 409/845-2807 Ag Communications Fax: 409/862-1202 107 Reed McDonald Bldg. Email: a-powell1@tamu.edu College Station, TX 77843-2112 W3 page - http://agcomwww.tamu.edu/agcom/satellit/rpe/alpage.htm