Just curious, what kind of whp gain does an EVO get with boost spiking to 20psi and holding 19psi at redline ? My friend just installed it on his evo and it felt like a huge diference!! Will there be any detonation or knocking to be worried about with this boost amount? Thanks

 

15-20 horsepower. make sure you are running 93 octane and you should be ok. the car is pretty rich from the factory but I highly recommend a good tune.