Nismo exhaust is only worth it if you DIY to save every penny.
Since my car is a daily and I live in CA, I did get the newer version to live on the safe side. It was either that or the Stillen that hangs low and costs more (despite potential gains). I've read some people claim it gets quiet near idle, and that was the case for me also, but I also had a Ecutek tune in play dedicated to the setup before the swap. Re-tune has it sounding better. Net gains over before I did the swap are kinda felt, but it's nothing amazing. I just did it because I'm trying to go as far as I can within my own bounds.
Mods otherwise are kinda wasteful and/or ghetto. Just put the money to a proper system. End of the day that's going to be what you wish you did if you tried to shortcut somewhere.
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