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I do know that the TPIS airfoil I put on my 96 LT1 did improve a bit. The literature shows 10-11 hp gain. I would think about 4-5 hp that I noticed. A larger TB, 52 or 58mm can do some help, but I have heard that a 52mm would not do too much for the money, as the intake volume for a 52mm is really noticable, but perhaps someone whom has actually done a 52mm change over may have some real data.
 
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