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Originally Posted by 2K3_Boxster_S
You can get 18hp if you do intake and full exhaust. see NHP exhaust thread.
Whether that's a minimal gain is dependent on what an individuals perception of expected results is compared to $$$ spent. It's not a cheap upgrade and it can't be done through ebay.
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Hate to point it out to you, but the NHP is made in China "cheap" stuff.