On many different Z configurations from stock setups to highly modded before and after the 2.5" piping added. Always results in a large midrange TQ bump and higher top end HP gains from before and after piping install with all else being unchanged. Did this exact experiment on my Silver Zed in 2016 from 2015 2015: Selin intake, 3" DP 3- 2.5 TP and the Stillen 2.5" catback that came with it 2016: AshSpec 2.5" piping and Massive ICs and 740cc/min injectors Results: 28 HP/8 TQ peak gain and a much healthier TQ & HP bump between 3-4K and better top end HP with less boost! ... but of course all these results are meaningless because someone on the internet says its crap... LOL
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