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More power and cooler IATs without using race gas.
Is not used when not at WOT
Simple install, maintenance and relatively cheap.
Cons:
Could fail at any point (Most kits alert you when this happens and your tuner can program the car to recognize the failure and pull timing to save the motor
Not needed unless your looking to add timing (get about 10% hp gain) or add boost (20% power gain)
2011 Grand Sport.ECS supercharged with headers. Should I meth inject or not. Pros and cons please.
Definitely do it! The difference in power for me was quite dramatic. I also added ECS's small blower cam as well. I am running a tvs2300 supercharger. I can't believe how well the car produces power in hot weather. If ECS is doing the installation and tuning you should be fine