I purchased this intake to replace the stock behemoth, and I noticed a change in sound immediately. Under-hood, you can hear the air being sucked through the cone, and the tone through the exhaust was slightly louder as well. Install was straightforward and easy, and only took 40 min or so. Don't have access to a dyno, so I can't verify any hp/tq gains, but I would believe numbers in the 15hp/60tq flywheel range. Definitely worth the money.