I have seached for this several times, and am probably not wording correctly, so I am going to ask. Friends, an indy, and a dealer, have not given me a straight forward answer regarding this question: I want a stage 1 upgrade, can I use all aftermarket products, or some aftermarket products or do I need all oem? Example 1: Spoke w/ dealer. Told him I wanted non-hd pipes, non-hd a/c, and non-hd fuel management. His response was warranty voided. So, I ask about all the above with the exception of HD fuel management. His response: "you have given me information that may void your warranty." Can I do a stage 1 that won't void my warranty?