I run the same axlebacks. The sound they make from a cold start is fantastic! I wish they always sounded like that at idle, even after warming up.
How do you like yours? I love the tone and growl. I love the sound and high and low RPM. Running down the highway/interstate at 60-70 is rough though (3.31 gears)... I find myself exceeding 80 for the sole purpose of getting out of the drone range. Magically at precisely 1.95k RPM - no drone. This spring I'm going to install 4.10 gears and that should help with the that among other things heh.
2013 Grabber Blue MT GT Convertible