K&NEngine Air Filter: High Performance, Premium, Washable, Replacement Filter: Compatible 2015-2020 BMW (740i, 518d, 520d, 520i, 525d, 530d, 530e, 530i, 540D, 540i, 620d, 630d, other models) 33-3079

Fitted to a G30 530d BMW, can't comment on any increase on fuel efficiency yet but the car does feel a little more responsive. In any event K&N filters are a good investment as they last for years and years if properly looked after and recharged when required. OEM filters for my car are not cheap anyway so this represents good value for money.I've had K&N filters or SRI's on some previous cars that were petrol and I can say they definitely made a huge difference to the cars especially in terms of improved sound and added a little performance. On a previous 2.0 petrol Hyundai Coupe with the K&N SRI the difference was incredible.With the BMW being diesel and sound proofed to death it's hard to say if there is any change in sound but as already stated it does feel a little more responsive even though I have no accurate way to measure the difference. Maybe the difference is psychological only but if it is it does it really matter as I believe it.

Good quality product at a very reasonable price posted from USA, cheaper than buying from Uk, anywhere by about 25%Fitted to my BMW x4 without any issues,Would recommend

The product did not fit my bmw x5 go5 even tho it states it will.

Brand quality and performance. An easy install and mod for the vehicle.

BMW 530d G31 0-60 improved from 5.3 to 4.75 seconds. That's quite impressive as it's not much more than a normal air filter.

Installed in a BMW 330e with relative ease. Can be trickier than other models to get access to the air filter, but once exposed, a simple swap. Noticed an increase in engine sounds when accelerating, which is nice. Car could be accelerating quicker too, but this is just a subjective observation as haven't done a 0 to 100km yet. Hoping it lives up to its promise of longevity as more expensive than others.