I ran just Z1 HFC with the short tails for a while and it sounded great! It was loud, but personally I didn't find it "too loud" at all. Since then I've added the s-line mid-pipe, which increased the volume pretty noticabely.
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Aam s-line mid-pipe|AAM short tails|Z1 HFC|Z1 Post MAF tubes|K&N Drop ins|Z1 20mm spacers|Eibach Sways|ARK GT-S Lowering Springs|UPREV|
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