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I have 23.5mm TBs that I have installed in our 1303, only because I bought a complete 924S (944N/A) undercarriage. it was always my intent to upgrade to lightly sprung coilovers + TBs as a cheap and effective way of increasing the wheel rate that is if I now need it with the increase in TB diameter that has added an additional stage in the process. I am not a fan of pure (only) coilover on the rear of a road car as the chassis needs beefing up to accept the loads imposed as well as NVH off the rear suspension. Invariably, the pure coilover route also loses the heat exchangers because of the necessity to install a ful 5 bar kafer cup brace, a solution to which I have not found yet. The loss of heat in our climate is a chilling thought!
If you are going to upgrade the rear suspension I still think that keeping the standard TBs and supplementing them with coilovers is a practical, adaptable and cheap solution. If you find that your first coilover spring selection is not suitable you can cheaply change the spring. Purchasing 23.5mm TBs new will not be cheap and 944 parts in the States appear to be less available than they are here.
Congratulations on your student placement! Barcelona is a great cultural city.
Clive
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