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My rotary exhaust has a 'box of rocks' muffler. It is always comfortably under the sound limit. Having said that, I'm looking to reduce weight of the car (it's WAY over minimum). This might be a place to get several pounds out of it. Please advise what brand & model muffler (or mufflers) you...

I just purchased a bunch of RX7 1st gen stuff (an IT car, a (rust free) gutted street roller + spares). One of the extra engines is a 13B but must be newer than 84/5 or early 2nd gen. It has individual coils, no dist hole in front plate and a factory crank trigger wheel. Exhaust ports are...