k03 outlet

k04 outlet

so when u say 45mm is this the size without the bead so the silicone pipe is tight down on shaft and has to stretch over the bead??
also i would think that welding the k03 outlet would further restrict the boosted air so is there not another way to make this an 'OEM' fit?
and if i have to do it the way you said then it is a good job i found this in a garage!!
