Originally Posted by
boostmonkey
I measured it. The OEM primary tubes are 1.75" OD or the nearest metric size. I would expect the ports to be slightly smaller and incorporate an inversion dam.
Gotchya.
Yeah the ports are tiny. I've often wondered why they used the same ID size for all the different displacement's but they seem to have thought that it was fine. Probably less cost so they said screw it
lol