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They may be using crank hp and gains in just certain part of the power band. There are plenty of dyno results for x pipes and intakes in the dyno database. Cars with all the bolt on mods including tune typically gain 10 to 15% power. The pump gas record for all the bolt on mods on a Dynojet in SAE is right around 400 rwhp. Stock, cars dyno in the 330 to 360 rwhp range.
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