Love the system, sounds incredible. Install took a good few hours with no prior experience. Called support (they picked up near instantly) who advised seating the header pipes into the mid pipe with a rubber mallet after getting everything lined up and that got me sorted. Knowing that going in would have saved me a good amount of time. Difference with and without the db killer is large. I have left it in for now and it's still quite loud. Makes all the right noises. Without a tune it doesn't obnoxiously pop and bang like I have heard with other systems. Just the occasional pop on pulling in the clutch and high rev quick shifts, and some nice burbles while engine braking, particularly down low and in 1st gear. Gets lots of compliments from fellow riders. Highly recommend.