Yes, it is loud (I ride a YZ400, the TTR is my girlfriends)
Yes it does boost power a bunch.
Spark arrestor is included. they also now have a small reducer (removeable) for low end power but it changes the exhaust note a bit. Not as deep, more restricted...
Also, make sure you open up the airbox, and the filter cage so it can breath better all the way through.
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