Good quality, looks good, easy fit to ford focus 2009 in just 5mins with adapter provided. Relatively quiet and unassuming during gentle normal driving but without a doubt the more you accelerate the louder and deeper the roar becomes. Seems slightly better fuel economy according to my trip computer on car (approx 2mpg more) and seems to run smoother,(but that last part may just be more psychological and wishful thinking than anything else!) All in all a good buy for around a tenner, not that much more than standard cardboard filter so would recommend it. Hope this was helpful....?