Just do it yourself. buy a o-ring kit and the r134 adapters, take all the lines off in the engine bay and replace the o-rings. not too difficult at all. invest in a a/c gauge kit, hook up to low side and charge with r134 to ~40psi on the low side with a/c running full blast.
im running r134A with no problems, runs cold enough for charleston, sc
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1993 RX-7 Touring MB, stockport 13B-REW, 9.4CR rotors, T04S 60-1/p-trim single turbo
1986 RX-7 Base project track beast
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