THE 50s/70s AND 110s EXHAUST,, ALL HAVE THE SAME BACIC FLANGE SIZES
BUT THE CT90 IS WAY DIFFERENT.... SO GET YOUR BUDDY THAT HAS A WELDER TO HELP YOU OUT AND CONVERT THE 90 HEADER PIPE TO THE SMALLER STYLE FLANGE,, JUST NEEDS A PIPE WELDED AND SOME FILING (EASY TO TYPE IT)(NOT AS EASY TO DO IT)
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