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Message: <blockquote data-quote="blackfang" data-source="post: 5901" data-attributes="member: 8011">No one insinuated anything. All that was said was that many see the NPI's as crap or they suck. In stock form,yes they do. In all reality for your average Mustang fan you can still go fast with them without spending a ton of money. People assume you always must have a PI headswap. You do not, that is just people jumping onto the bandwagon, saying I need PI heads and PI cams and PI intake, when they really have no clue what they need. For the amount of money you spent on PI heads, you could make more power porting the stock NPI's. Fact, you can make decent power with a PI intake/cams and ported NPI heads for your average joe. However, if you want a serious engine and will be spending alot of time at the track competing, then yes I wouldnt use the NPI's and go with a ported PI head, and cams.</blockquote>