Its funny because terms like “hybrid turbo” mean different things in different car circles.
It used to be (in the 80’s-90’s-00’s) that a “hybrid” turbo was any turbocharger assembled with compressor and turbine wheel/housings from two different “off-the-shelf” turbochargers. It started when people discovered you could easily attach a bigger Garrett T4 compressor and housing onto a T3 turbine and housing, (usually called a “T3/T4 hybrid” and “T28/40” and went from there.
This is a distinction because Garrett, Mitsubishi and many others have built many different size turbos on the various “frame sizes” that you can buy off the shelf, many of which have interchangable parts within a given frame size.
This also means that any “bolt-on” turbo that uses the stock or cast exhaust housing with a different compressor housing would be sort of a subset of “hybrid”. The S280, or anything from Pumaspeed fall in here, as do others.
By the old definition, the Whoosh, X37/47 would have been considered an upgraded “stock frame” turbo, or sometimes “cheater” turbo, being a K04 inside a KP39 housing. The original DSM “bastard 20g” was probably one of the first of this type - a MHI 20g CHRA with clipped wheels fitted inside a stock size 16g compressor and TD05H exhaust housings, which produced more flow along with the most awful turbo lag imaginable.
What we’d call a “Big” turbo (requiring custom exhaust manifold and/or O2 housing/pipe) people would just refer to by the myriad different specific off-the-shelf turbo models (GT35, GT40, Holset Hx, Borg Warner BW, etc), because there are way too many unique different turbo manufacturers, frame sizes and power levels to just lump them all together. Also, it’s adorable that we all call a GT25 “big” here. 😂
The definitions above still persist in the DSM/Evo and Subaru communities, and I imagine some others as well, where “stock frame” turbos can now push north of 400whp on pump gas (Evo X stock frame turbos on race gas have hit 600+) and hybrids and custom turbo setups shoot the moon (450-1200+ whp drag cars).
In short, I end up translating this way:
DSM -> Ford
Stock Frame -> Hybrid
Hybrid/Bolt-On -> S280, Pumaspeed, Etc
Custom XYZ -> Big
But times change, and here we are in a different car circle with different marketing terms, so whatever floats your boat. (Hybrid vs “Big”) 🤷