I use many Race gear sets and recommend PPG only in the R33 GTS/GTR gearbox only, SR20 PPG IS a weak Toy, They dont even take what the stock SR box can. I have seen 300rwhp kill them after a very short time. Modena is the best for most cars.
Our S14A IPRA Racecar Uses the RB25 box with the Kiwi made adapter kit.