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Most people are in the low to mid 160s rwhp range on 6M with intakes headers and exhaust. My theory is that they make about 175-180 hp when install with a factory 5M computer and all the US spec parts. You should be able to get the 190 hp if you installed all the JDM spec parts and such but nobody does that. I would recommend a turbo setup if you are after power. I wasted a ton of money building a 6M and I haven't been able to get out of the 170s rwhp range.
 
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