)How many % can be lower? How much is the TUFoil? K&n drop in filter nomarly outside can get how much?

im using myvi 1.3 sx. and i already installed K&N drop in air filter + NGK Platinum Spark plug.. this already give me extra 20km per bar. stock is i can run average 50km per bar.. nw, 70km per bar.. myvi got 8 bars ,full tank.. 8 x 70 = 560km per full tank.. very2 satisfied with the result.. just that need to be light on the pedal la.. hehe.
note: my myvi running on Shell V-Power 97..![]()
is the any difference in term of sound from the box if we change to k&n drop in air filter?
sorry noob here
Ohhh ya regard tufoil can lower ur FC from 5% till 10 % depend on ur car.my persona b4 using tufoil was 8.8L per 100km.after pour the first times 8.1L per 100km on town driving condition(a bit heavy foot also). the engine more smoother and quieter. ha ha rm59.90 well spend...