Okay--here's my opinion. You need something to manage your fuel system. Your engine breathes easier and it exhaust with less restriction. I don't know anything good about your fuel injection system and I have never heard much good said about the system you have. Watch your plugs. They will tell you how your engine is burning. JMO
IMHO, you should've taken any mod's out prior to getting the dealer involved. They just suspect a reason to squirm their way out and they will. The only thing I'd leave on is the pipes. You can use any type of pipes with the stock ECU as long as you leave the stock A/C installed.
Man I’m glad you said that becasue some disagree with me… I have the BSS and a stock air cleaner as that’s what the dealer said would be fine, have an occasional back fire, and some deceleration gargling but it not to bad. Since V&H are double walled they look fine, but underneath they are blue so yeah probably running lean but from the factory I suspect. Would like to get a thundermax and try that out, hear good things about it…