I have a 2006 FXSTBI and when I return from my deployment from Iraq, I want to replace the stock pipes. Anyone have any suggestions for me? I am real new at upgrading bikes, and or changing parts so I am not sure what to look for. I would like to go with Screaming Eagles straight shots. Do I have to change the air filter as well? I thank you all in advance for any help you may offer. Take care, and ride safe.