If you're looking for a direct, bolt-on replacement for your 5.9 Cummins 1998.5-2002 that doesn't require a core charge, the AFE 46-60062-1 GT Series Turbo is your ideal solution. This turbocharger offers an 18HP and 47 Ft-Lbs increase over stock, and features a billet adjustable wastegate actuator. The ported shroud helps to reduce turbo bark, while the gold anodized 8/16 bladed billet aluminum compressor wheel provides superior spool-up. With a 56mm inducer and 81mm exducer, this turbocharger is the perfect upgrade for your Cummins engine.