I also woulda used ABS piping instead of PVC, as it has a higher heat resistance than PVC would, I dont know how hot that pipe might get being in the engine bay behind the radiator on an august day at idle. Also PVC stands for polyvynle chloride if I'm not mistaken meaning it would most likely give off chlorine gas under high heat, wouldnt that be bad for an engine, I dont know just taking a guess there.

I gotta do the DIY CAI on my AE92 .