just wanna see what every1 thinks ... basically ive got a mk3 1.8 16v sport i have a K&N cone induction fitted and its havin' problems going thru the MOT, the bloke at the garage rekond the CAT had gone but I cant see a problem or hear a rattle on it i reckon its the K&N sucking in more air causing a higher fuel micture but could i be wrong? Ive heard of variuos sensors such as the lambda which may be te problem but i just wanted to see what you lot thought and try and sort the problem b4 the next MOT in may as i dont really wanna fork out for a new CAT .

Thanx !