I just went out to one of those you pull it auto wreckers and got a 65 mm
throttle body from a early  '80's BMW 525. 85 mmx 85mm four bolt flange, 95
mm long, 850 grams ( I'll take off another 100 grams) $12.95. Good deal.
Brian Trubee
Redmond, Wa

Sounds about the right size at 3.346 inches in diameter. Can't hurt
to be oversize with port fuel injection.
Glad to see people are going up on the size and down on the number of throats.
No need for a three throat throttle body. Just adds weight and internal 
aerodynamic drag to the intake manifold.

Paul Lamar
 
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