[sendler]

So, I want to make a tuned runner for my 2011 Honda CBR250R motorcycle with it's fuel injected single. Has anyone seen a web site with a good calculator? This bike already has a huge airbox and air filter and a pronounced tuned runner extending into the clean side of the air box. It might already be as good as it can get for fuel economy but I have no idea what the tuning frequency currently is. It might be as high as 8,600 rpm where a big power peak develops whenever an after market exhaust is fitted. I might like to extend it to get the tuning to match my 65 mph cruise rpms of 6,000 and accept whatever reduction in peak hp at higher speeds that result.