T or Y heat shrink transition options

what brand or material would you guys recommend for transition in wire harness. i am going to use both raychem dr-25 and SCL on the main wire harness but not sure when transitioning what are my best option. looking for T,Y, 1 to 4 transitions

Only 3M, Hellermann Tyton and Raychem make moulded shapes suitable for Motorsport harnesses as far as I know. They are generally very similar sizes and prices between the brands.

Tee's and Y's are relatively common, but it is not very common to use 1 to 4 transitions - although they are available, most professional harnesses that I see for a multi-leg transition use a straight boot backfilled with epoxy for any more than about a 3 branch breakout.

https://www.hellermanntyton.com/products/heat-shrinkable-moulded-shapes

https://www.te.com/global-en/plp/raychem-heat-shrink-boots/ZnE3Y30A4.html

And this is good for cross-referencing: https://www.cambridgetechnologies.com.au/documents/resourcecentrepdfs/Hellermann-Cross-Ref1.pdf