Mate the thermostat is just about the same to the std one apart from, the (copper looking) sensor is a slimmer profile thus allowing more water to flow past it into the radiator.
The lower bypass valve is identical looking to std one (length, diameter & spring) apart from the obvious it's now slimmer to fit inside the new hiflow upper valve.
EG lets say the sensor body (the moving copper bit) in the middle of thermostat chassie is a 20 cent piece wide.
but the new sensor is now a 10 cent piece.
in turn this opens up the hole allowing more flow.
Wish I took a pic when I did it, but sorry I didn't have any time to spare then.
look at this it's not a TD hiflow but the smaller 1 is the std TD job which I just removed.
the other is a TB hiflow physically larger, but for something to look at for comparison sake to just get the Idea of std to hiflow.
letf= std, right= hiflow.
DSCF9171.JPG
cheers
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