does the wku in your name stand for the hilltoppers? i go there but i don't know as much as i should about your question, but i can tell you that tons of aftermarket exhausts work with your heater boxes, so that's no problem.
if you are in fact in bg i can tell you what i know of the veedub community here.
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1979 'vert w/944 NA brakes + Boxster S wheels and begging for a paint job and a Subie swap
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