It's the way this engine is designed that makes the hissing noises. It's there stock but can't really be heard because of the restrictiveness of the exhaust. You can lessen/ pretty much eliminate the hissing with better exhaust designs. The x pipe design is going to make the hissing louder but there is a way around it. Again it's all in the design of the exhaust. For example. The fi exhaust comes out of the cats and goes straight into an x pipe. The fi x pipe crossover is very small and creates Alot of hissing through it. I switched over to the invidia exhaust and noticed that the hole in the x pipe is larger to allow more air to crossover and flow with less turbulence. Also there are resonators right before the x pipe on the invidia exhaust to quiet to hissing down. There is virtually no hissing from the invidia exhaust. The fi exhaust hissing was almost unbearable. If companies start to use invidias design or even better use resonated x pipes I believe everyone will be much happier as there will be little to no hiss. I tried telling Tony this at fi only to be told that the different x pipe design would make no difference and that it was a characteristic of this engine and that nothing could be done to change it yet when I switched it made all the difference in the world.
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