If your sportage is difficult to start or hesitates (not the same as slow) or runs rough then you might benefit from a new fuel filter. It is not a performance part. On the other hand, if you upgrade coil module and wire and plug set and increase air flow (without setting off the MAF sensor) you might benefit from a less restrictive fuel filter. In other words more gas doesn't help without more air to burn it with and more spark to ignite it.
I don't know about your warranty. The warranty must be transferred officially I would imagine. Paperwork showing you as the registered owner and all remaining warranty transferred into your name showing how many miles on the date of tranfer.
I have no idea where to find neon glow lights, sorry. There are some guys with some neat street mods on their vehicles, you might want to look at ebay.
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