To be honest, there is almost no increase in horsepower, but that's why you shouldn't buy it. THIS THING SOUNDS AMAZING! Not a cheap rice sound, but a full, deep growl that's rare on Miata. Would definitely buy again just because my 99NB sounds so much better. It's almost as easy as Tower Brace and took me about 15 minutes, and to be honest it's one of the most useful mods just for its phenomenal snappy sound!
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