Alright guys, so e99, now has a whopping 96k miles and the injectors seem to be getting louder. I've noticed over the year I've had the truck that that have gotten louder. That could be from the foil delete and 6637 but maybe not. So i decided to over up the valve covers and re-torqued everything. Each one was between 1/2 and 1 turn low of torque. Still no change in injector noise. So what i'm really asking is what things are out there to quite down the injectors and what do you think about these ideas and which order you all think

FRX
Regulated fuel return (Whats the difference between this and FRX)
ITP/Sinster diesels pre-pump kit
Intank mods, which is what the ITP kit does.
I'm going to get the hpx soon, but that should have no effect on injector noise should it?

Let me know what you think i could do, I'm up for any suggestions, even the more common, GET OVER IT its a diesel....

 

If you are getting air into the fuel lines, then you'll notice a difference after doing the fuel mods. If you aren't getting air, then you probably won't notice much in terms of noise reduction. The in-tank and pre-pump mods are designed to get rid of that problem of sucking air into the fuel lines.

FRX and a regulated fuel return are sort of similar. Both remove the dead head fuel rail, but the regulated return adds an external regulator instead of relying on the stock regulator on the side of the stock fuel bowl. It's for a more precise fuel pressure setting, and easily adjustable with the turn of an allen wrench.

 

Curtis answered most of it. Also, don't forget that sometimes an oil change can make a big difference. Maybe even try a synthetic.

 

10 4, sounds good. I think i might try to get the FRX and install that and see what happens. Plus next oil change i'll do 5w40. which is only 1k away