12 valve stuff and what it does
Stock turbos
There are tons of hybrid parts that can now be installed on a stock charger. Most of which are hx40 parts. The turbine shaft is the same diameter allowing for many different options. Compressor wheels from 60mm to 67mm and hx40 turbines in 64 and 67mm, 10 and 12 blade configurations. Turbine and bearing housings can be machined to fit these parts. You can buy aftermarket turbine housings for the HX35’s which open up the exhaust flow a bit.
H1c 56/58/16,18 or 21cm bolts together 3 inch outlet (first gen)
Wh1c 56/58/12 bolts together 3 (early 2nd gen)
Hx35 56/58/12 large snap ring 3 (late 2nd gen)
He341 56/58/9 large snap ring 3 (vp44 24 valve automatics)
He351cw 58/60/9 large snap ring 4.4inch outlet
(early common rail)