I would seriously suggest putting a stock(3.8") pulley on it until you do the obd2 swap and can really tune it. Also headers are basically a must for a 3.4, the stock manifolds are really restrictive. Even with headers, you could still have KR with a 3.4 pulley. Scanning is a priority for these cars because they vary so greatly. What works for one person could be catastrophic for someone else with the same mods.