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I purchased an electronic boost controller (greddy profec spec 2) off craigslist and don't think it works but want to ask and make sure before I contact the seller. The controller reads boost pressure just fine, but it does not activate the valve unit solenoid. I've hooked a battery up to the...

Alright, I've had the same 12" kicker L5 for the past three years. Time for an upgrade right? Louder is better, but sound quality is more important. My L5's sound seems to be "dirty" during some songs. Is this because its so old, bad settings, or just a mid-level setup? How much better is two...