After searching here, I'm still not sure, so I thought I'd ask... I'm looking to switch out my stock pipes on my '09 Nightster with the black Screamin' Eagle slipons. Do I need to have the stage 1 air filter kit and/or dyno jet or anything else when I do this? Or can I just switch them out? Since $ is an issue I need to know how much to save up for! Thanks!