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I dont think there is a stamp. ITR TB is the biggest amongst all the B-series TB. Same as the intake manifold. The runners and the plenum are bigger than the B16.
Remember that B16 and ITR intake manifolds are interchangeable. LS is by itself. GSR is by itself.
All B-series ITB's are interchangeable. I cant remember their sizes tho. ITR is the biggest.
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