i used 3/4 inch on an enclosure - with 2 JL AUDIO 10's - works great-- purchased piece like 4'x3' for $80.00 well worth it - 
silver frost 98' svt--tint, stereo system, kkm intake, glasspack, optima, carbon fiber, superchip, side markers, adj. koni's, eibach's, coilovers, axis 7evens 19x8, nitto 225-35-19
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