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Originally Posted by Kato
If you car is not tuned, slipping a different turbo on won't stop boost cut (that's an issue with your tune).
No need for surge tanks and stuff if you are only going to play. Just put a full tank in when you start.
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If it's not tuned Kato that is another issue but a GOOD exhaust such as the butler I had on the stock VF43 and a 2.5 cannot get enough air out the waste gate to properly control boost.
We proved it with mine by disconnecting the waste gate and holding it fully open. Still managed to make it to boost cut.
Subaru's dodgy dump pipe design is what makes it possible to control the boost level with the stock turbo. Once that is replaced you will have issues regardless of tune.