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Walt, I would be surprised if TWM used a different casting for the 44mm and 46mm sizes of the throttle bodies. They probably do something similar to PMO-- use a single large casting and then bore to fit. I bet they would tell you if you inquired. The real question becomes whether you can actually send them your 40's and get back 44 or 46s-- that would be a great way to proceed because they know all the tricks.
My only concern with boring them larger would be the risk of damaging them, but I suppose that is the risk with everything.
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'66 911 #304065 Irischgruen
‘96 993 Carrera 2 Polarsilber
'81 R65
Ex-'71 911 PCA C-Stock Club Racer #806 (Sold 5/15/13)
Ex-'88 Carrera (Sold 3/29/02)
Ex-'91 Carrera 2 Cabriolet (Sold 8/20/04)
Ex-'89 944 Turbo S (Sold 8/21/20)
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