Originally Posted by SS_Firehawk

Definitely agree with everyone, I was expecting something... lol. I'm still on stock cats right now and no tuning was done. When looking at the uncorrected numbers, on the chart with all the runs, you can see the intakes are adding power up top. On both dyno plots on the uncorrected graph that has Z1 intakes, it's making more power up top. When we start looking at SAE results, everything gets masked in calculations.

Edit: Those cats are definitely bottlenecking the exhaust. I guarantee opening that up would gain at least 10whp no tune on RTP's or TP's. It's almost like confirmation that to get more power over a Nismo exhaust with an aftermarket exhaust, you need to replace your cats.