I have just bought a K&N 57i induction kit for my wifes 9-3 conv (54REG). It now gives load of pssst and wooosh. K&N incidently dont list an induction kit for the 175 vector.I bought one for the Aero and it fits perfectly. Took me less than half an hour to fit. Acceleration is better aswell or at least I think it is. It could be the noise but it definately sounds good. Only been fitted a day and the wife doesn't like the noise.
It might sound nicer but it's extremely unlikely to improve performance at all. The stock air filter is very good and capable of supporting much higher power levels than stock without significant restriction.
It has not brought on the management light. I bought it off ebay as it was £12.00 cheaper than K&N RRP. I paid £88.99 inc postage. Bought it from revs_online. Hope this helps.
i use a k&n panel filter and you hear the Pssst sound but only when the window is open i got it off ebay £30 ish
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