I'm back!! Did some searching on Google and the Holset site, but couldn't figure out how to determine which hotsides I have. I believe one is a 12cm^2 and the other a 9cm^2 (so I was told). Where exactly do I measure to know which is which?
5 speed, 4 cylinder, 3 diamonds, 2 liters, 1 turbo, 0 chance of losing.
Spec number is always stamped on the outside of the housing somewhere as well as the inside of the inlet (manifold flange). On this particular 18cm HX40 housing it's stamped on the housing itself, not on the downpipe flange, just under the part number. It's easiest to just look inside the inlet.
There are no 9cm HX35 turbine housings to my knowledge- the smallest I've seen is 12cm. The HY35 uses a single-scroll 9cm housing. The smallest factory HX40 housing known is a 16cm divided T3....anything smaller has been machined to fit.
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