I have an 06 FXSTBI and the V&H big radius pipes are on the way. I need some help on two things: 1. Any recommendations for the high flow breather? 2. I read TCSTD's post titled "Tuning Fuel Injected Bikes" and I have decided to go with the SERT. I am going to have the dealer install the SERT and dyno it. TCSTD said not to go with the HD download because it could cause problems. What problems? Also, if the dealer is going to install the SERT, are there any other options besides the HD downloads?