Hi. Here is one review from a happy axle back customer.
I've had the pleasure to get out on the road these last two days to.from work and I'm pleasantly surprised with the tone and volume of the NA axle-back system. My initial thoughts were "where's the noise?", but after pushing on the go pedal in a more spirited manner, it provided a very nice audible response. I wish I could say it's exactly what I wanted, but I honestly did not know what I wanted. I just know I didn't want the entire neighborhood to know when I came and went, but when I hit "go", I wanted to know it more than just a little tire squeel. I am really pleased with the cruising volume - marginally louder than stock; as well as the more agressive volume under acceleration. I think you've got a really nice product that hits the spot for those that really don't want to "stand out", but would like more than stock.
Thanks Chris, we're glad you like it!