under 16# and I wouldn't waste time putting studs in. stock gaskets and bolts will be fine. I'm going on 4 yrs w/ 15+ lbs and never pushed any water. like said a good tune plays a role in it too.

 

sound performance is going to be doing the tune 90% of there stuff is FI they been tuning for a while and make a lot of there own stuff I've seen cars there from other country's and a lot of high $$$ builds and 35+psi 1000+ HP is common in there shop so i'm confident they can get it dialed in