Great work. We have done the same on our race car, it was a fun project. it did improve the engine performance, in smoothness and power band. I have 2 strong suggestions for you. The first is to add a cold intake to the air box, either from the hood or from the front grille, sucking hot air from the engine bay is never good. Take the time to go on a Dyno and try 3 different lengths of trumpets . ITBs are really sensitive, if those trumpets worked for someone, it doesn't mean they will work for your car or setup. Changing trumpets or adding spacers is the easier way to fix unruly ITBs. Feel free to ask anything you want.
Thanks! I am limited by space so these are about the longest trumpets I can use. I may add a vent right above the filter in the hood, so we'll see. And the thing about this setup is that I can't find anyone else who's done it even though it's a manufactured manifold with Toyota ITBs on a K20. The only thing I'm worried about is if there's enough gap around the trumpets and the box, I can go longer if need be.
If you can't find info, then you should really go on the dyno. That would be the best 200$ best spent. Understand the best length for you, then worry about the packaging. A rough rule of thumb is that each inch can move the peak power by 1000rpm. Any flat surface perfectly in front of the trumpet entrance will cause the pressure wave to reflect and increase the "tuned length" of the system. Additionally, to help packaging you can add curves, like we did.
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