Maybe you could stack them and get multiple horse power gains,LOL did you ever think of that?
Them plates I feel are a waste of money for the HP increase you get from them.
What are they like 100 bucks,and maybe at best you "might" get 3 to 7 hp gains,and some are "0" gains.
Save your money,take your wife out to dinner.You'll get a better retirn for your money :P :P :P
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There Is 1 Thing Better Than Cubic Inches,,,More Of Them