Well, the MBE Big 9 heads are a well-regarded option for ProCharger and other boosted LS applications. They offer significant potential for power gains and improved performance, but come with a higher cost and increased installation complexity. If you're looking for a top-tier upgrade for your boosted LS engine, the Big 9 heads are definitely worth considering. However, be sure to factor in the additional costs and tuning requirements before making your decision.