Evolution® Charge Air Cooler with Patented High Temperature Silicone Grommet Tube-To-Header Seal System. Warranty is void if Dura-Lite Part # US-IHDAC-9B with Serial Numbers under 499,999 (1 5/8" [41.3mm] Thick Core) Charge Air Cooler is used on any application over 430 HP. Dura-Lite Part # US-IHDAC-9BS (2 1/4" [57.2mm] Thick Core) or Part # US-IHDAC-9B with Serial Numbers over 500,000 (2 1/4" [57.2mm] Thick Core) Charge Air Coolers can be used on all applications with a factory installed engine. Please call Dura-Lite™ Customer Support at 800-661-1117 for confirmation of Part #.