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I would say that the polishing of the Tb and the removal of the air grid in the upper intake manifold did add a measurable difference in rear wheel hp, ie, a gain that would be shown on a dyno.. I don’t think the spacer has added any measurable gain, although it may help with throttle response. It is not possible that you have gotten a 25 rwhp gain with the mods you have added. An Overkill tune adds 22 rwhp. So I think apolishing of the Tb and removing of the airgrid did not give more than an ecu reprogramming by the best v-6 tuner in the country. It is fun to make your car perform better, and I will say that you have done that. Good luck with your modding and tuneing
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