You are not going to get into 13s with just a pulley and a cold air intake. Sure you could run a small pulley a custom tune and race gas like Twinv6, but thats not an everyday driver. A 13 second every day driver you would probably need a cam but I could be wrong.
No a cold air induction on these cars does absolutly dick. http://www.grandprixforums.net/dyno-...ake-33225.html Make your own just search homemade intake or diy intake.