Subaru Impreza 2.5RS
At $25 to $30 per plug, the HKS Super Fire Racing Plugs aren't cheap. But they do improve combustion to the point where we're really starting to worry about the limits of our fuel system. Once we upgrade our engine management system, we'll be able to get a better picture of the performance gains offered by these trick little plugs. Right now, we need more fuel and better ignition control.
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