I am still trying to decide on my 2.5 inch exhaust 68 firebird convertible. Either the Pypes X system with transverse Racepro muffler, or the Thrush H-pipe system with Dynomax or Magnaflow transverse muffler. I wonder which one fits easier with the convertible frame brace.
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1966 Lemans convertible 455/5spd
1968 Firebird convertible 400/4spd
Need more Pontiacs!
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