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Then you have a non Rev Up engine so this concept does not apply. You can use the spacer alone. Like the above mentioned post, it is porbably the best bang for your buck to get the MD 5/16th Iso Thermal Spacer kit with a JWT Pop Charger and the NISMO exhaust.
MRev2 alone is better bang for your buck, it showed more gains than Spacer alone, also more area under the curve.
I have the Nismo exhaust it sounds SICK! I will probably be going pop charger with it. Many members on here have that set up and are really happy with it.
