to keep the warranty valid you have to show proof (receipts or maintenance log) that you have had the machine serviced every time it was supposed to be. like after the first 10 hours or whatever you have to take it to a stealership and have them change the oil and check everything out, and they will sign and initial the log. if something does break and you can't show proof you had it serviced every time it was due, they're not obligated to fix it under warranty. not to mention the warranty doesn't necessarily cover labor charges like other people on here have said. for those reasons, i canceled my extended 4 yr warranty today. that's an extra $674 to go towards my loan since i just got the raptor and warranty two weeks ago. i figured that since i haven't read about any reliability problems on here, i should be safe to go without a warranty... if not, it'll just have to come out of my pocket! just my 5 cents... :lol: if you read through your warranty paperwork when it comes it spells it out in a little more detail... but it doesn't really mention mods so it's up to your dealer if they'll cover it a lot of times. good luck!