No, the LPF is just a resized GT 2.0
The 2.1 is a newer esc. (I think specifically designed for stock racing, but not 100% sure about that)
So, for your 22, the SP range would be:
GT 2.0
GT 2.0 LPF (same as GT2.0 but smaller)
GT 2.0 Pro (same as GT2.0 but with extra features, the best ones being the 'supercharger' and ability to use USB to update the firmware)
GT 2.1 (Prostock or EX)
You might want to check that the GT 2.1 is suitable for your racing as they are specifically targetted at stock and possibly touring cars.
If it was my choice, I would go for the GT 2.0 Pro if you can afford (and fit!) it.
The 22 doesnt have much space, so I know some guys have been using smaller LRP esc's to help fit everything in.
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