Having gone through this, I will warn you: the manifold from a TR6 will almost
certainly not work out well on a GT6+.
The problem is bonnet clearance, especially for the front carb. The TR6 has a
relatively flat bonnet, but the GT6's droops quite a bit. You will either have
to raise the front of the bonnet (quite a lot) to clear, or get a stepped
manifold from TriumphTune. (Even with the stepped manifold it's a tight
squeeze, and we won't start talking about air filters.)
You might get lucky and find someone who wants the TR6 manifold and be able to
effect a trade or sale and still make a good deal on the rest of the bits. But
it isn't a straight bolt-on proposition.
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