I have a 2009 RKC with the TFI, slipon's and SE Air cleaner. I've been running this for over a year now. Today I just installed the TFI and SE Air on my wife's 2011 Softail Delux (she already had the slipons). No problem. I did both in about 3 hours. Only had a little trouble getting to the fuel injection plugs. Other than that, it's not hard at all. All of the posts you read regarding the TFI being great is true. Just take your time.