Re: Air Pod for EBII 5.0L
One other thing that you might want to try is to slide a length of 3" stainless exhaust tubing into the duct between the airbox and TB, so it smooths out the airflow through the convoluted (flexible) section of this ducting. Just measure the length of the flexible bit, and make it about 20-30mm longer. If you look at some of the companies that make replacement ducts for the commodores, they reckon replacing with a solid piece is worth 5-8 Kw, and in the US C&L makes a solid duct to go from the MAF to TB, and they reckon a 2 RWHP gain too. This is a cheap way to get the same result (in my opinion anyway).
These gains aren't huge, but for the money (under $5), its pretty easy. I used a few hose clamps to stop it moving around (and consequently wearing out the ducting), and so that these didn't look so obvious i covered them in black electrical tape first (it really doesn't look bad, honest). One tip, put a bit of WD40 or similar on the tube first, to help it slide in easier.
Its pretty hard to get the duct back on again, as it doesn't move much now, but once its on, there doesn't seem to be any problems with it not having enough flex in it. I've had this on for a couple of months only, so time will tell if it creates any other problems