CSF Radiators are made from military grade aluminum to surpass any other radiator on the market for quality and durability. Each radiator undergoes the most testing we've ever seen, with everything from burst pressure to wind tunnel testing, CSF demands the most out of their radiators to ensure they are the best performing and highest quality radiator you can buy. Each radiator is designed to have drop in fitment, and require no modifications for installation. CSF even ensures their packaging is the best. Each package is built to withstand a 10 foot drop to make sure that when you get your radiator, it's flawless. CSF Radiators Feature: Drop-in fit radiator requires no modification for install Designed with OE fitment specifications and mounting TIG welded military grade aluminum"B-Tube" technology offers 15% better heat dissipation than standard O tubes Undergoes leak, thermal cycle, burst, vibration and wind tunnel testing Ideal for any type of racing or daily use"Show Stopper” hand polish mirror finish Fitment applicable for both Automatic and Manual transmissions. (132,orig) Vehicle Fitment : 2006 BMW 325 07-09 BMW 328 06-10 BMW 330 09-10 BMW Z4