gear change and top speed

Wanted to get some feedback from people who have done a gear change and how it has affected the performace of their cars on the hwy. As i'm sure all of you know the top speed on my 99 cobra is done in 4th gear. With a new set of lower ratio gears it puts you in fifth going the high speed pulls. Please let me know how your gear affected your top end pulling power not your top speed.
 
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