Morning all.. hope everyones having a good day so far... heard the other day that you can fit the 1.8 throttle housing to the 1.6 sxi mk4 (02) plate astra g's.. is this true?.. and if so has anyone done it and noticed any difference?.. also been working on trying to get a good note out the engine.. i know.. sounds sad.. erm currently got a pipercross cone foam filter on it.. just wondering if anyone has come across somthing that sounds better?.. any ideas welcome .. cheers =)