Hey guys, im new here. Joined the forum to get some info for my buddy. Hes got an 08 raptor 250 all stock. Hes interested in upgrading the exhaust and wants to know everything he has to do in order for the engine to run properly with the upgraded exhaust. I happen to be a Yamaha Blaster owner (2 stroke if any of you dont know, also on blasterforum.com as "BigBoyBlaster" if anyone knows me ) and know that whenever upgrading the exhaust, you MUST re-jet the carb. Is it the same with a raptor? I wouldn't see why not but im better off letting you guys explain. Im sure there are other things that are necessary besides slapping the exhaust on and rejetting so let me know what else there is to do(if anything). Hes thinking about getting a full exhaust system but if not then just a slip on, most likely HMF. Any reccomendations on pipe selection would be helpful too. Hes doing trail riding mainly. Thanks anyone for their help!