75mm is worthless
unless you port out the TB adapter.
The stock bore size on the TB adapter is about 72mm maybe 72.5mm.
Therefore I buy the MAC 73.66 TB if you do not want to spend the extra dough on porting the TB adapter. I had mine ported out at the tone of 140 bucks for all the work that had to be done.
75mm TB and ported and (somewhat) polished TB adapter install
Hope that helps
unless you port out the TB adapter.
The stock bore size on the TB adapter is about 72mm maybe 72.5mm.
Therefore I buy the MAC 73.66 TB if you do not want to spend the extra dough on porting the TB adapter. I had mine ported out at the tone of 140 bucks for all the work that had to be done.
75mm TB and ported and (somewhat) polished TB adapter install
Hope that helps