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The potential gains are probably in the area of about 1 hp. Really, unless you are trying to flow something like 800 hp worth of air, its not going to make too much difference. Unless you can sell your 1 1/2s for more than the cost of the 1 5/8s, its not really going to be worth it.
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1989 240SX Fastback. . . . . . . . . . . . . . . . . . . . . . . . . . . 1995 300ZX Twin Turbo
Warning: Objects in mirror aren't as fast as they thought they were.
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