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Originally Posted by andrewmp6
whats the biggest turbo that fits the stock exhaust manifold and turbo elbow on a rb25
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Any T3 or T3/T4 turbo will fit. The highest horsepower, readily available turbo that will bolt on is a T3/T4 with a 67mm compressor. Stage 5 wheel is about the biggest exhaust wheel that you should put in a T3 exhuast housing. A P trim will fit, but is not a good idea.