What about the vf series turbos? that's where I will be looking first when turbo upgrade time comes for the RS 40.

In Mao (& Gordan's) defence, he always placed an emphasis on reliability when helping me tune my old bugeye, which despite my best efforts I never managed to blow up

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"ALLPAWS" 2014 WRX RS 40 - modding very slowly.
2002 Mitsubishi Airtrek Turbo R - Ralliart Edition (daily)
2010 Nissan GT-R - when the Missus let's me drive it :)
Crotch Rockets . . .