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Discussion Starter · #1 ·
Hey everyone, quick question.

I know that some of the pros of removing the cat on a turbo car are gains in horsepower and sound. Are there any cons, like increased fuel consumption or excessive smoke or anything like that?

Any idea on average gains on the RB25DET engine?
 

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R34 Next?!
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Theoretically removing the catalyst will improve your fuel economy. It doesnt make that much difference to be fair. No smoke petrols dont produce the black smoke you see with diesels.
 
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