2006 Dyna Street Bob, stock exhaust. I want to change out stock for some Cobra's The HD dealer said that it will void my warranty...

I am looking to get a new Harley Davidson 883 Iron and have no real idea of what kind of concessions I can get out of the dealer. I'm looking at about 700 dollars worth of accessories that I want, and maybe an extended warranty. Is that possible? How much haggling can one do with HD?

I bought a Genuine Harley windshield for my Harley from a Harley Dealer, back in April, less the 90 days ago and more then 30 days has pasted. I took the windshield back to the same deal because one on the quick release clamps broke. With receipt in hand! First the counter man said they can’t warranty it because I put reflective tape on the bottom of the front of the windshield. I said it’s the clamp that’s broken, and the nuts, of all things, have rust on them. He went and talked to the parts manage, back and forth a few times and the parts manager came out to tell me it’s a 30 warranty not a 90 day warranty. They are going to replace the clamp, because they are deep down nice guys but not the windshield because they can’t warranty rusty nuts.
The worries part of talking to the parts manage is he said they can’t warranty rust on the nuts because they don’t know what environment the bike was stored in. I asked to see the warranty document and he said there wasn’t one.