K&N Engine Air Filter: High Performance, Premium, Washable, Replacement Filter: Compatible with 2014-2019 RENAULT/SMART (Twingo, Forfour, Fortwo, Cabrio), 33-3043

I have used K&N for many years, they definitely improve performance and sound better than the paper rubbish ones.

Easy to fit. Not going to increase power but they are easy to clean and do sound nice.

I've been using this for about a month in my 2015 Renault Twingo, and not only does my throttle seem more responsive, but I have noticed an increase in fuel economy. Whilst this may be a higher cost initially, I reckon you'll make the money back in fuel saving fairly quickly. Easy installation, took no more than 5 minutes.Other points to note is that you can hear more of a "whoosh" from the turbocharger, and combined with a new blow off valve, and a cat-back exhaust system, the car sounds like a beast!

Brilliant filters, help the engine breathe much better...and you can use them lifetime.. no brainer