Eu am avut un filtru K&N la opel... si sincer nu mi s-a parut ca a modificat ceva. Aceasi concluzie au tras-o baietii care au scris testul acesta:
http://www.tuninglinx.com/html/air-filters.html
QUOTE
(The number 100% states the maximum flow resistance to the air, meaning the air is somehow obstructed maximum by the filter or the air box itself while passing through the combustion chambers. Numbers lower than 100 indicate that air flows more easily relatively to the conditions represented with the number 100. It is natural that the air will flow most easily if you detach the filter and the airbox, thus the lower number is 37.5 meaning the least resistance has exposed to the air.
stock box w/ filter 100 %
stock box w/ K&N 100 %
stock box w/o filter 100 %
modified airbox (trimmed) w/filter 62.5%
modified w/K&N 56 %
individual filters 44 %
manifold only 37.5%
Cu alte cuvinte, prima data modifica-ti modul in care intra aerul in cutie, abia apoi merita sa te complici cu filtru K&N.