My problem started out around a month ago when I realized I was going in and out of boost, so I replaced the bypass valve thinking that was the problem. Now, after that I still have no boost and now there's a grinding noise coming from the passenger side only when I get around 2k rpms. The engine has just over 105k on it and simple bolt on mods like catback exhaust, cai, and a WMW 17% with the smaller belt and colder plugs. Any thoughts or suggestions are appreciated! Thanks!

 

Have you checked the crank pulley? It may be time to install an ATI damper

 

I have but I'll be sure to check again. There was a slight movement in it but not as much as people have made it out to be.