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Yes I did on my 99. I purchased it last year with 28,000 miles on it. At some point the original owner whom I purchased it from put in the K&N dual air intake. I took the car down the local 1/4 mile dragstrip a few times with the K&N and after recently replacing it with a VaraRam intake my time decreased 0.3 -0.4 of a second just like VaraRam guaranteed.They equate that savings as an increase of 35-40HP. This is no joke. I was very pleased.
Dean
I added the CAI mod from Forum Member Dave68 to my Halltech Stinger as well as cutting out around the fog lights. I could tell a SOTP difference, but I don't have any numbers to back this up. See instructions at www.conceptualpolymer.com (really easy). Good luck!