I am considering changing the stock pipes on my 08 Road King Custom to Rush pipes that my Harley dealer will install for me with the breather kit, download and finally a SE Pro Super Tuner that is priced at $459.95 (100 more than the pipes)!!! They said that without the tuner the gas mixture will be all screwed up and void the warrant. What gives on this? Is the super tuner necessary? If it is, no problem, if not, why is Harley pushing it on me. Thanks for your help.