If you search the thread created Khoi from AAM regarding their s line mid pipe he provides information on how the stock Nismo exhaust is more restrictive than a true 2.5" daul exhaust. I think the bottom line is if you want the least restrictive exhaust set up for NA Nismo, you will want change your exhaust. However, you can make decent gains with a CAI, ART pipes (test pipes) and a tune. I chose a little different setup and I am happy with my gains!!! There are a lot of different options and it can be confusing, but think about the outcome you want and then go for it....but be careful, cause when the mod bug bites, your outcomes will change!!!
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