I have had my 99 I4 for about 2 months, before installing my ractive muffler it was hard to shift from 3rd into 2nd when slowing down. Ofcourse I was at a speed where it should easily have gone into gear but I had to sorta jam in into gear two. Now that I have my muffler installed I noticed I can put it into second a hell of a lot easier. The same goes for dropping it into first. Can anyone explain this change???