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I'd go half inch and then increase from there. 1 inch provided a nice deep tone but there is a little drone (more noticeable on steep inclines). It is also noisy inside when driving at speed. I have just put a std box back on and it's nice to be able to hear my music again without turning it right up.
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2003 Boxster S
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2003 Porsche 986 3.2s Tiptronic
Threaded Mode
