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Ep3 K24 turbo gearbox problems

Hello I have a k24a turbo ep3 it’s 460 bhp 6 speed with a dc5 lsd and I keep stripping 4th gear. Had it back 8 days and stripped again already the maps not that agresive ect. Iv heard about a 5 speed people use for the turbos ep3 supposed to handle the power better anyone used this box? what’s it like ? Any information appreciated
CPL do a modified quaife box for such applications but it’s big money.

There’s a couple companies in America doing similar too. PPG being one of them