you should look up Dr. Color chip. I have used this for my black G37 and FX50 works 500 times better then any pen. gooogle them and what you see in the pictures before and after is exactly how it works. it is worth every penny. i love this product will never buy a pain pen again
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Originally Posted by SAM@GTM
Engine detonation is not normal and it should never never happen, and whoever told that need to do something else for living .
Sam
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