ZPI was having some cal problems with a CAI for the TRD. The problem, they determined, was the distance of the MAF sensor in relation to the throttle body based on piping ID. This makes some sense as the MAF reads an amount of air at a certain velocity. If the MAF is placed too far away, I can see where there might be some off-throttle issues caused by a delay from when air is measured and the time that it hits the throttle body.
I am with the last post. If the cheap route is not working, then buy an engineered piece from a reliable company.
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