I have no experience with svt tunes so I'm staying out of that one!
make sure to check clutch materials as well. I'm not positive if spec and clutchmasters use the same ratings etc.
for the jetta a spec stage 5 held less torque than a stage 3 clutchmasters
'03 VW Jetta TDI
'02 Chevy Corvette Z06
'87 BMW 325e