Ill admit i contemplated dropping $75 on a hunk of platic with holes in it for about a month an a half. Prior to tst airbox i just did the stock airbox mod and drilled a dozen hokes in it. This definitely made a difference but the stock cover still had that silly inlet facing the rear of the bike, and since these groms dont go backwards its pretty useless, robs airflox if anything. So i bit the bullet and got the TST cover. Its solid, great quality and feels very durable. Deeper growl and can feel it make a huge difference at mid rpm. We live once..buy it all