Finally got around to taking the fender well off to see if my Mr. 5 style intake will fit on the 135. There is definately less room for the filter than on a 335.
This DIY shows the filter installed horizontal at the frame, but on the 135 it appears that the only place it might fit without moving somthing in the bumper is down at the belly pan next to the where the charge pipe connects to the FMIC.
Some adjustments to this DIY roughly appears like it might work, but
1) the big bracket holding the Power Steering res will likely have to come out (unlike this DIY on the 335)
2) Filter diameter might have to be carefully chosen in order to fit in the tighter space.
I'm not sure if I want to go the extra mile to make this work on my 135 since i'll likley be adding meth soon and will be OK with DCIs while running meth.
Anyone been able to make the Mr.5 work on thier 135i yet?