Hurricane ,Lingefelter or vararam my shop guy wants to install Lingefelter,I know they have great rep but is their CAI getting the most HP , I like Vararam it seems to have the most direct ram air design, but I should listen to my performance pro right ? .By the way this upgrade is suppose to support the rest of my mods being done on monday , port and polish heads MAF TB spacer thermosat and tunning that will make it all work, hope I got these mods right my car is an A6 and this stuff seemed to fit my budget