Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
⚠️ California Proposition 65 Warning : Some products sold on this website may expose you to chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.
For more information, visit www.P65Warnings.ca.gov.
I was excited to install the Sinister Diesel spring kit, but it didn’t fit as expected on my 2007 truck. After a bit of back and forth, I ended up sending it back. The quality looked good, but it just didn’t work out for me.
M
Mark Wilson
Works as expected and fits without major issues
The build seems durable and the alignment improved after installation. It helped stabilize the vehicle at higher speeds.
C
Carlos Mendez
Slightly Confusing Instructions
The quality of the Sinister Diesel blue spring kit is great, but I had a bit of trouble with the installation instructions. They could be clearer, especially for someone who's not a mechanic. Once I figured it out, it worked well on my 2004 Powerstroke, though!
S
Samantha Lee
Worth It for Better Fuel Control
I bought this fuel regulator kit for my 2006 Ford Powerstroke, and the difference is noticeable. The blue spring kit provides better fuel control, which has improved my truck's throttle response. Just be prepared for some tinkering during install, but it's well worth it!
M
Michael Thompson
Solid Upgrade for My Powerstroke
I recently installed the Sinister Diesel blue spring kit on my 2005 Ford 6.0 Powerstroke and can already feel the difference. The billet spring housing is solid, and the fuel regulator kit works perfectly. Installation was straightforward, and I appreciate the boost in performance!
Yes, we offer free standard shipping on all orders within the United States.
When will I receive my item?
Domestic orders typically arrive within 3-5 business days. Delivery times are estimated and may vary depending on your location, weather conditions, or other unforeseen factors.
Can I change or return my item?
We hope you love your purchase, but if you need to make a change or return your item, we’ve got you covered! You can initiate a return or exchange within 30 days of receiving your order. Please ensure the product is in its original condition and packaging. For more information on our return policy, please visit our Returns & Exchanges page.