This isn't unheard of especially if you do not retune after a full exhaust system install. Sometimes the so-called "hi power" exhaust systems are made with much wider diameter piping which sometimes is overkill for a stock engine resulting in a reduction of low end torque and/or high end HP. What's also interesting is that most of the 18 HP gain on the Nismo cars was achieved by the exhaust system redesign. So the OEM Nismo exhaust is not too shabby, just quiet as f**k.
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"That’s when you know you’ve found somebody special. When you can just shut the f*ck up for a minute and comfortably enjoy the silence.”-Mia (Pulp Fiction)
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