despite the custom "folgers can" hole patch, i think the muffler on the '75 1.8 needs replacing. but before i go out and get one, i need a question answered.
i've heard on a couple occasions that "backdating" the entire exhaust system can add a nudge of hp to a 1.8. if this is true, what (if any) additional muffler options are opened up if i do this? and what roadblocks will i encounter? what component parts are necessary? thanks,
~a
p.s. restoring this car is turning out to be a lot of fun (aside from the persistent vacuum leak... grrrr), and i appreciate the mass knowledge of this forum, without which i would have learned and accomplished little.