I just bought a 99' S80 T6 yesterday. 127,000 Miles runs great. I am also a 95' Nissan 300ZX TT owner.

Q1: I am anxious to hear from the avid volvo enthusiasts, what are the first upgrades you would recommend to extract the maximum amount of HP out of this car, giving the highest rate of return?

Q2: What is the maximum Boost The stock engine / transmission will allow given assuming 12:1 A/F ratio?

Thanks in advance!