Contour Enthusiasts Group Archives Forums Modifications Duratec Performance top end

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but is there a mod that work specific for making more top end power and mid range power say 70- 100 that part of the range??

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That is merely a speed range, not necessarily top end or mid range. Top end would be ~5000-7000rpm and midrange ~3000-4999rpm. You can be in 5th gear going 70 and only be at 3000, while 4th gear would be at ~4250 or so. I know this has no impact on the question, just wanted to clear up his thinking.