Im from 3si.org I have a modded vr4. Anyway My parents just bought a 95 Riviera I know its not a Bon. But figured you guys would be the best sight to ask. Its supercharged so is there a cheap pulley upgrade? Am I correct that this is still a series 1 motor(cars not here right now)225 hp sound correct? How much will a filter and pulley add? Im very farmiliar with turbos and tuning of our cars Ive run 11.6 at 119mph at 18psi in my car which I built myself.(just a little background) thanks Tug

At http://www.pulleyboys.com you can get smaller pulleys for $95 I think. With that and an intake you can add around 30-35hp EASILY.

You want the 2.5" pulley.

thanks guys.Willwren 2.5? Sounds good also can I just use like a k/n drop in? Whats the stock boost and what will it raise it to? One more thing I read somewhere that the 95 comes with a 2.85" pulley and 92-93 has a 2.55" pulley so would this also be sufficient? If so anyone have their stock pulley from a 92-93 for cheap? I have paypal. I live in Elmira NY and have a friend in Albany with a Stealth.

Forgot to ask is the only difference in the series 1 and 2 -the 1=uses a m62 blower and 2= uses a m90 blower? other than that they the same?

There are alot more differences in other parts as well. The series 2 got refined some and some bolt patterns, opening positions, and other misc parts may have a slightly newer designs makeing them incompatable with the older series 1 engines. Series 1 is also OBD1 where as series 2 is OBD2. You are right though about the blowers.