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1st example : - My Z : SZ short split DPs, SZ TPs, Stillen 4-tips cat-back : very quiet (and I like it). - Friend1's Z : Megan Racing DPs and TPs, Stillen 2-tips cat-back : pretty louder. 2nd example : - Friend2's Z : SZ long split DPs, SZ TPs, SZ cat-back with resonated X-pipes : way louder than - Friend3's Z : SZ 3" expansion DPs, SZ 3"->2.5" TPs, SZ cat-back, no resonator. Conlusions : 1) Thicker pipes will be quieter than thinner ones (the sound, especially in the cabin, doesn't come only by the muffler's tips). 2) SZ 3" expansion DPs will lower the noise.
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