I will be getting a stage one done next month on my 07 EG. I was told this is just slip ons and tweaking of the EFI, not a problem. I wanted to go with better pipes but three dealers insinuated that it would cause me warranty problems if HD determined the Non-HD pipes were a contributing cause for the problem. Does anyone have knowledge in this area because at Stugis and the other rally's you always see a mountain of stock pipes getting tossed out. Also besides V&H is there other makes that would give a EG the classic HD throaty sound.