The IFS has the later suspension set-up (the lightweight reversable set-up, which does give you some more tuning options.. if you wish) The std ta05's have suspension like the older EVO4 Which is more durable as it has bigger bearings in the hubs.
There is also a new TA05v2 coming out very soon. It has the same suspension as the trf (albeit plastic non carbon re-enforced) and a different motor mount, and a more narrow chassis. It will probably be around £130-40 ish as the exchange rate isnt that good atm
basically, they are all good. get the one that fits your budget best
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