Faint Hint Of Oil Smell In Cab?

[topdwg]

Alright about a month ago I installed my oil bypass kit and if you read my other thread you know what happens when you don't tighten down the hoses all the way. Anyway, when I installed my turbo I cleaned up everything, but for some strange reason I smell a hint of oil through the vents when I turn on the air. I've looked all over and don't see any oil anywhere, I know there isn't any leaks. Plus my oil level is perfect. So what gives anyone ever experianced this? It only started doing this when I put my bypass kit on? It's freaking driving me crazy!