18" is great, very low drone if any. Ive been around the non res ones and wow are they loud. I dont think the wife would ride with me anymore if mine were that loud! haha
Good item, free bump!
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2009 370z Solid Red Touring/Sport/Navigation/Illuminated sills/LED interior lights Red/LED plate lights White/ Evo R fog light in Red/Stillen G3 intakes/ Fast Intentions Exhaust with 18" Resonators/ Rays Gramlights 57fxx/ Swift Springs/ Fast Intentions Resonated Test Pipes. NST SUCKS DONT ORDER 
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