Okay, so I have been looking at upgrading my 883 sportster exhaust to something that makes it sound more like a harley. It doesn't sound bad now, just want a little more. I think I have settled on the Rush slip ons, as I like their loudness and low tone. My local HD has them for $299.99, though I may be able to find them online cheaper. But I do have some questions.. My dealer says to get the exhaust, put it one, then bring the bike in for a stage 1 download ($149.99) to richen up the bike, and also a high flow air cleaner ($149.99) Now here are my questions: Do you HAVE to have a stage 1 download for just putting slip ons - on? Could I get the stage 1 download first, run the bike stock, and then a few weeks later add the exhaust, then a few weeks after that, get the air cleaner? Is the air cleaner mandatory? Now, bike is still new (only has 200 miles on it), do I need to wait, or should I wait past the 1000 miles to do any upgrades? After the break in period? And lastly....does any of the above mentioned void the two year warranty? Thanks a bunch!