The inline pump is noisy!. I found out why my car broke a piston land. The damn wire connecting the inline came loose (little nut holding it on). At the end of my piston's life I faguely remember hearing the pump sometimes but not others (hmmm wonder why I was leaning out), so hearing the pump is a good thing in my book. I'm in the mix of rewiring all of the pumps wires, 10gauge wire, straight from the battery to the relay, etc.
I should have done it from the start, but when I put the kit on, there were no 2gnt forums or anything give me tips, so don't say it.
Just make sure you wire it good bro