the stock 19lb injectors are orange in color, 24lb is blue and 30lbs is red, I have never heard of yellow ones. Usually an aftermarket pump is loud but you are right about the pump going out, I had a pump that was extremely loud for about 4 months till we swapped it out and had it checked, which they said it was on it's last leg, but our aftermarket one seemed just as loud, I also beleive the larger pump you go the louder it will be.
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