Yeah you may consider it nessesary if you don't like quiet bikes. I havn't knocked out my baffles yet and I can't hear the motor, I'll fix this soon. Now I did ride one once with the stock shorty TOR mufflers on it and I'll say that I couldn't hear that thing at 50mph. It makes noise at idle but not at speed. You just roll along like falling through the air. Give it a little gas and it sounds like you dumped a bucket of rocks off the back, it leaves sound behind you like puffs of smoke. Stock Harleys are like this too, my buddy says at speed he only hears the wind. I have an old Harley that makes noise in every way, its like riding in a hurricane and holding a chainsaw at the same time, the Triumph is somwhat of a releif after this, but I will make it louder though.
Also opening up the pipes and air intake gives the bike more power. Theres a lot to read on that around here.
Some say loud pipes save lives, one guy on here retorted that quet pipes are a luxery.
