Get both, the pulleys are cheap. I thoroughly went through all the reviews about the pulleys, the people who had issues with them kept coming back to bad installs. As soon as the pulleys were installed, the throttle response improved and the car felt preppier.
The M370 gave a deeper sound to the engine and serious torque & power in the midrange. I did the mods serially. The car sounds amazing and pulls hard (I easily spin the tires even with VDC on).
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370Z NISM O #0462 | ClearBra | 3M tint | Head/Taillights | Dynamat | Black Roof | Tommy Kaira HB | CF Parts | Berk HFCs | FI SS | NST Pulleys | Takeda aFe | K&N | H&R Spacers | Swift Spec R | SPC F&R | Zuperman M370
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