Thread: bootmod3 Stage 1 OTS map testing - 93 octane, dyno - 100+whp/wtq over stock baseline
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      10-21-2018, 06:50 PM   #123
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Originally Posted by FAKE__NEWS View Post
Brother ran Stage 2 on his X5M. 36k miles. 5k miles into Stage 2, cats needed replacing. Put two and two together, but thanks for your take!
Haven't heard of this, but S55 primary cats are very different than V8's cats (more restriction).
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