Well, if its been asked b4, im sorry. Im not gonna scroll back through 170+ pages, however, ive been following this thread for a while now. Maybe they are just bz at the moment.
Anyway, let me share first. Im currently running on a 2.5 inch piping from the flexi-pipe all the way to the muffler ie a 2.5 inch piping. BTW, this is for my 1.8mivec.
The reason why i asked about piping size is bcoz im feelin a little slow on the pick up speed but have very nice gains on mid/high speed. Max speed i dun care la as long as i can go about 210-220 liddat...