I did the besian seals. I noticed the difference right away. Although I did he vanos seals a little after I already had the supercharged in. But it was only running 6psi at that time and not it's current 8psi.
BMW 2006 M5 - REALLY LOUD
Audi S4 2000 Stage 3 - Dat turbo spool
BMW 2000 3-series - Supercharged Because race car SOLD
Maserati 2004 M128 GT - HREs/tint/straight piped SOLD
BMW 2006 M3 - stock - SOLD