I have a tial 38mm wg it won't hold boost with a big spring but seems to hold it fine with the 5.8psi spring very puzzling..The diagphram was scuffed alittle trying to force the big wg springs..Its not torn though just a scuff i think we keep pulling the seal out with the big spring because i'm not useing a clamp and doing it by hand..Either way 80 bucks shipped

Also have a 5.8psi,8.7psi,10.1psi,14.5psi,15.95psi wg spring

20 bucks a piece the 15.95 will be 40 its 2 spring shipped..

i got paypal and vouches..