wtf is a gktech throttle body and why did you remove the stock one?
The stock TB is good for over 400 real world horsepower. You exceed that then your option is often a Q45 TB.
Better to use an OEM part than something... foreign aftermarket. I've used the OEM KA24DE TB on many a 400HP sr20.
And now I see its a pulley of some kind. Nevertheless- why remove the stock pulley? It broke? those throttle bodies are cheap enough you could have a pile of them on the floor next to you for $50
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