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Refer to this thread https://www.hdforums.com/forum/softa...e-loudest.html As far as 2 into 2's go, Rinehart's are about the best torque monsters you can get. Very tunable, and if it's tuned correctly you shouldn't have any flat spots in the torque curve at all.
do a forum search on true duals and you'll find they're not the way to go if you're all about performance. if you like the look and sound of the true dual and don't mind giving up a little on the bottem end then go for it. butt dyno prol won't know the difference anyway....
the stock '09 head pipe does the job well, so it's up to you to find the sound you are looking for.... head to the dealer, or local pub on the weekend and listen....
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