I have a set of 38mm ITB from a bmw k1200gt bike (2002-2005), and a 1.8 16v KR engine sitting in the shed, and I was thinking on fitting those ITBs to it. I will make the trumpets tapper from 50mm down to 38mm. Are they big enough to flow enough air for about 180-190bhp ? I've seen lots of people fitting 40mm/42mm/45mm ITBs and I didn't find any inflo on 38mm ITBs. thanks in advance!
