Sinister Diesel Blue Spring Kit with Billet Spring Housing - Fuel Regulator Kit - 2003-2007 Ford Blue Spring Kit 6.0 Powerstroke – Fast Install – Replace OE # 3C3Z-9T517-AG 3C3Z9T517AG

This is a very nice kit. All items arrived in the kit as described, good quality and easy to read instructions. My 18 year old was able to install on his 2005 F250 without any issues. Highly recommended Sinister Diesel parts.

6.0 powerstrokes live and die by fuel/oil pressures. This is cheap insurance to make sure your fuel pressure is solid. My pressure actually went up 6-7 psi ! Install is super easy , I had mine in in 30-45 minutes after cleaning everything and taking my time.

Works perfect! Love the look. Great upgrade!

This is one of the cheapest and simplest upgrades you can do to your 6.0 Takes 20 minutes or less to install I’ve done the two trucks and I’ve been pleased with the results

Didn’t notice any difference but I don’t think it’s that kind of upgrade. Install took about 45min.

My first diesel experience. Not a diesel guy. Can tear a gasser down and rebuild it but was nervous about diesels. Great instructions easy install. Don’t have a FP gauge so couldn’t tell you that aspect but replaced the oem spring. No problems. Big blue housing looks cool under the hood 👍🏻*edit* Still can’t express how important a fuel pressure gauge is!! Had this on for maybe a year? Lost an injector and while it was down and before I put new injectors in I added a gauge found out I had little more than 30pounds. Took this apart and the larger o-ring had deteriorated and a large chunk had become lodged in the plunger, a wonder I had any pressure at all. Not sure if it was the biodiesel ,which is all I can get, or what but the boring didn’t last. Add a gauge and don’t just trust that this will fix it and you won’t ever have to worry again... all that aside I’ve now replaced it with sinisters regulated return

Nice product 70 psi after install. If you have a fuel gauge sender, the billit housing is really thick and this required a small extension to keep the sender from hitting the regulator housing. With that said, great quality and does the job!

i thank it helped

Really really great product, everything you need and a little extra. Shipping was incredible they had it out of there shop with in a few hours of order. I look forward to buying more from sinister diesel. Night and day difference on my 05 f350. Very clear easy to follow instructions. The only problem I had was the sticker that came with the product ripped.Side note, thank you sinister diesel for using an Allen key head instead of torque bit like oem