Mike
All the aftermarket seem to drone a little. The EP1 has minimal drone but sounds like a dumptruck on start up, it was too much for me in the hospital garage. the speedtech will drone a lot more.The kline sounds pretty good, minimal drone but fitment was an issue for me. I assume they've fixed it. I ended up with a FVD modified stock exhaust. They basically add 200c HJS cats to a stock exhaust. sounds good, only about 20% louder than stock, zero drone. I can email you a clip if you like, but if you want loud, this isn't for you.
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