Hi everyone, i wonder if anyone can help me, i have been considering fitting a pipercross viper induction kit to my Focus 18i, but after reading some earlier posts 04 05 06 i noticed some people were having problems after fitting K&N induction kits with the ECU and therefore the car would not run correctly, initially i was considering a K&N 57i Gen II induction kit before the viper, that was until i read about fitting a ST170 Snorkel, Auto Air Deflector and an upgraded panel filter, so will these fit without any modifying and will they give me the same sound and performance of the induction kit..