Performance gain? acoustic attenuation? or marketing object? We answer these questions by testing the foams on the market! The foam is a wearing part that must be maintained and changed every 6000km. But since it is an element of the intake, its technical characteristics imply an impact on the performance of our two-wheeler. But does simply changing the foam change anything? ... ...To be sure ❤ , WE TEST! ????Promotional code: thanks to your favorite channel????, you can take advantage of a 5% discount code at SCOOTFAST (that's already something! ????). the code is: SIMONSF The material tested in this video: original foam: https://www.scootfast.net/air-filter-... Malossi foam: https://www.scootfast.net/malossi-air... Doppler foam: https://www.scootfast.net/doppler-air... POLINI foam: https://www.scootfast.net/polini-air-... Carenzi foam: https://www.scootfast.net/carenzi-air... the air box with transparent cover: https://www.scootfast.net/boite-a-air... the original air box before 2004: https://www.scootfast.net/boite-a-air... the air box after 2004: https://www.scootfast.net/boite-a-air... The material used: The differential pressure gauge (if anyone is interested!): https://fr.aliexpress.com/item/100500... ???? Small links to essential tools for disassembling/reassembling your two-wheeler: A very good electronic caliper and always useful for this type of measurement: https://www.amazon.fr/gp/product/B082... PISTON BLOCK: https://www.scootfast.net/bloc-piston... The ratchet wrench set with tips TO DISASSEMBLE EVERYTHING: https://www.amazon.fr/dp/B07G2PN3CG/r... the vice you need: https://www.amazon.fr/gp/product/B01M... ⚙ Small config. : Good parts to optimize your scooter, easily: 50cc POLINI cast iron kit: https://www.scootfast.net/kit-cylindr... YASUNI z exhaust: https://www.scootfast.net/yasuni-exha... 17.5 PHBN carburetor: https://www.scootfast.net/carburateur... POLINI Hi-speed variator: https://www.scootfast.net/polini-vari... programmable rollers to adjust the variation to the hair: http://www.mir35.com/galet-programmab... With that, it will already be not bad! 00:00 Introduction 02:48 1 - how an air box works 05:37 2 - Depression tests: the theory of performance! 11:48 3 - Acoustic tests: what do foams change? 14:16 4 - Performance TESTS 17:42 Conclusion and thanks + SCOOTFAST PROMO code I am Simon and I make mechanical tutorials for all 2-wheel enthusiasts, 50cc scooters or more. If you want to see me tackle specific topics, I will try to look into them: do not hesitate to tell me in the comments the topics you are thinking of. To ask me questions, technical difficulties, with photos, you can use the Instagram account linked to this channel: The Instagram account of the YouTube channel. https://www.instagram.com/p/CD1_0Aini...