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My 91 GT already has a decent collection of performance parts and runs 12.40 at 111mph. I saw an improvement in 60ft times and 1/4 mile times when I switched to the heavier Ram flywheel from the factory piece but I was still in the mid 13's at that time. I saw a article and from what I remember the aluminum did out perform the steel but they had to launch at a higher rpm to achieve the same 60ft times. But the aluminum did ultimately outperform the steel. I do all of that type of work myself so labor costs aren't a issue. I see Summit has them for about $410. If I were getting ready to buy another flywheel I might consider spending the extra $180 and get the aluminum. If the car ran .15-.2 quicker I would consider it worth the extra $. But I have a relatively new steel flywheel already so its hard for me to justify spending another $410 for maybe 2 tenths.
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