It could also be a bad o2 sensor. I get the P0300 code all the time since I removed my cats and the ECU is freaked out that the readings between the two sensors is not different and thinks it is a “rich” condition and throws the code. So you could get a new o2 sensor or get the free version of Torque and a BT ODBII reader and clear the code when it happens. Perhaps the installer of the exhaust damaged the o2 sensor.
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'14 Nismo AAM 3" TD / AAM Test pipes / AAM CAI / Lowered on Swift / Synolimit Ported TB, upper and lower manifold /DW 1000cc injectors and 340 pump / ECUtek tuned by Hal @ Dynosty / 331whp/268wtq on E85
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