20 hp isn't a bad gain for the intake and TB, considering your stock heads and MAF are probably the bottleneck. I bet if you add a set of TW or AFR heads and a new MAF you'll gain 10 mph+.
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Russ L
'91 LX - 331 w/ Procharger
'03 Cobra Convertible - Pullied
'94 Lightning
'65 Mustang Coupe
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