I have a set of mac underdrives on what is now my parts car. It also had a high flow water pump to compensate for the cooling issues. I only ran the car for a month, but the damn thin would never warm up and go past the first white line.
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Jeremy
1986 Mustang GT Convertible
1972 2 door 302 Maverick
1994 POS head gasket clubbed broke down T-bird with $6000 left to pay off
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