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Message: <blockquote data-quote="Dalamar" data-source="post: 557021" data-attributes="member: 8116">those heads do look promising.I like the fact that they've moved the valve location and have the runners improved.the larger chamber for compression compensation on the NPI's is very usefull for 96 to 97 owners.I'd be weary about number Hype, and realistically 400 NA from a 281, I don't believe it.Being a 98 you already have PI heads.Realistically mid 400's is pushing the limit of the rotating assembly and transmission.I'm talking loaded rear wheel power. if you want dynojet or flywheel HP you're fine at +23%A blower will delivery more power than just new heads. if you can afford both, great, go for it.you'll also want to look at at least a staul convertor for your tranny, and some basic suspension upgrades.</blockquote>