Sinister Diesel is your one stop shop for Ford, Chevy, GMC, and Dodge diesel performance parts. Sinister Diesel is also the number one source for Diesel Racing Components, Exhaust Systems, Tuners, Ford Powerstroke, Dodge Cummins, and GM Duramax engine repair parts, upgraded EGR coolers, lighting, bumpers, grilles, and suspension components from our parent company Sinister MFG & Sinister Diesel®. We offer the biggest names in the industry to help you repair or modify your Powerstroke, Cummins, or Duramax diesel engine.
Is Sinister Diesel legit?
Sinister Diesel (sinisterdiesel.com) has a 4.5 out of 5 rating on OK.one, based on 198 user reviews collected here. It is listed under Vehicles & Transportation and its reputation is excellent. 86% of reviews are 4 stars or higher and 6% are 1 star; The business has replied to 44% of negative reviews; Reviews mostly discuss Product, Quality, User experience. Last updated 2026-09-08.
What reviewers say
AI generated
Reviewers overwhelmingly had a great experience with this company. Customers frequently praise the high quality and outstanding performance of the products, noting that everything works exceptionally well and fits their trucks perfectly. People also appreciate the fast shipping times and secure packaging, making the entire purchasing process remarkably smooth and easy.
However, some people mentioned frustrating issues with unexpected backorders and prolonged delivery delays. A few consumers also noted that certain replacement parts required unexpected modifications or extra adjustments during installation. Despite these occasional challenges, most buyers remain very satisfied with their overall purchases and intend to order again.
Auto-generated from all reviews of this business. For reference only.
I use the turbo pipes to make work trucks more reliable. I had two different trucks with 6.7 deletedPowerstroke hot side pipes fail. I bought new oem pipe, which immediately failed, first on one truck, then the other. I didn't want to spend so much, but was worth the money, because it has not failed since.
Reply from Sinister Diesel2026-09-04
Thank you for sharing your experience. Keeping work trucks reliable and on the road is exactly why we build these upgrades. We’re glad the investment has proven worthwhile for you and appreciate you trusting Sinister Diesel with your trucks.
I ordered a total of two cold air intakes one for my 2017 Cummings and one for my 2024 Cummings. My first one showed up very fast looks sounds great and gives me a lot better fuel mileage on my 2017. I decided to do a build on my 2024 and that was the last piece that I needed. I ordered it and the payment went through I watched it on my bank account they said the estimated delivery date was on July 1st, July 1st I got back on track my order and noticed it was delivered in Nebraska and I live in Maine. I went in the panic mode so I screenshot the delivery address in Nebraska the delivery guy dressed that was on the order and I sent all of those to the company. The email I got sent two to three days to make a determination it was approved and they sent me another one. Honesty and integrity go a very long ways I have a beyond grateful for for the company sending me another one. Customer service is what makes the company and you guys nailed it thank you.
Reply from Sinister Diesel2026-07-10
Thank you for taking the time to share your experience, Wade. We're glad you're enjoying the intake on your 2017, and we appreciate you trusting us again for your 2024 build.
We're happy our team was able to get everything sorted out and make sure you received the part you needed. Taking care of our customers is something we take seriously, and your comments about our team's honesty and service mean a great deal to everyone here.
Thank you again for your support and for choosing Sinister Diesel. We hope you enjoy both builds, and if there's ever anything we can help with, just let us know.
Hot pipe came in when it was supposed to. Easy to install and looks great under the hood. Definitely going to order more upgrades as needed
Reply from Sinister Diesel2026-06-25
Thank you for the review! We're glad everything arrived on time and that you're happy with how it turned out. We appreciate your business and look forward to helping with the next round of upgrades whenever you're ready.
S
Scott Johnson · 1 review · Experienced 2026-06-16 ·
★★★★★
Received the parts
Received the parts. Have not had time to install yet.
Reply from Sinister Diesel2026-06-25
We appreciate your business and hope the installation goes smoothly when you get the chance. If any questions come up along the way, don't hesitate to give us a call, we're happy to help.
Engine Oil cap filler looks super cool and more reliable.
Reply from Sinister Diesel2026-06-16
Thank you for the review! Glad you're happy with the oil fill cap. It's a small upgrade that makes a big difference under the hood. We appreciate your support and your business.
It was easy to install. Did it in about 10-15 min.
It was easy to install. The only challenge I had was finding a bit to remove the cap that was already screwed into place. I had to remove it to add the third nipple for the connection. Once I did that, it was smooth sailing after that.
Reply from Sinister Diesel2026-06-04
Thanks for sharing your experience. We’re glad the install went smoothly overall and that you were able to get everything wrapped up in just a few minutes. We also appreciate the note about the cap removal, that kind of feedback is helpful for both our team and future customers.
Thanks again for choosing Sinister Diesel, and if you ever have questions, we're here to help.
Had to purchase 2 replacement hoses due to poor craftsmanship. Shipping cost was 35 dollars each time. For a single hose in a box that would fit in your hand.
Reply from Sinister Diesel2026-06-04
Hi Michael, we searched our system, but could not find where you purchased the original kit. Did you purchase directly from us? If it's been within 2 years, we usually warranty items. You can always call in or reach out through our help center.
https://sinisterdiesel.com/help-center.html
We understand that shipping cost is high, I believe the $35 is for 3-day shipping, we do offer a less expensive option through ground. We hate hearing that your experience with us was not a good one, please reach out directly if you have any problems in the future, we'd like to see if we can help you resolve them.
I ordered an upper radiator pipe for my 13'-18' Ram 3500 6.7 Cummins. Part arrived 2 days earlier than expected and looks absolutely amazing on the truck. 100% functional as expected. 5* all around!!
Reply from Sinister Diesel2026-05-29
Thank you for the great review! We’re glad the pipe arrived ahead of schedule and looks right at home on your truck. Hearing that everything fit, functioned, and met expectations is exactly what we like to hear.
We appreciate your support and the 5-star rating. Let us know if we can help with anything in the future.
Very well made products, high quality and everything is well packaged. Sinister Diesel also ships quickly and good instructions. I plan on buying their products for a long time. I love everything they make and will highly recommend them!!!
Reply from Sinister Diesel2026-05-26
Thank you for the great review. Our team puts a lot of care into the quality of the parts, packaging, and overall experience, so it’s great to hear that stood out to you.
We truly appreciate the continued support and recommendation. Looking forward to helping with your future builds for many years to come.
A
ANTHONY SMITH · 3 reviews · Experienced 2026-04-22 ·
★★★★★
All was good
Reply from Sinister Diesel2026-05-26
Thanks for the review! Glad everything worked out well. We appreciate your support.
J
Jeff Foster · 1 review · Experienced 2026-04-03 ·
★★★★★
Great people to talk to when you call…
Great people to talk to when you call them.
Reply from Sinister Diesel2026-05-18
We appreciate that, thank you. Our team works hard to be helpful and easy to work with, so it’s great to hear that stood out.
D
Darwin Griese · 1 review · Experienced 2026-05-08 ·
★★★★★
Outstanding Performance
Reply from Sinister Diesel2026-05-18
Thank you! Glad to hear the product is performing the way it should. We appreciate your support and your business.
I ordered the blue spring kit for the 2003-2007 6.0 powerstroke. it leaked and the adjustable jam nut kept coming loose causing my fuel pressure to constantly change. i removed it, cleaned it all and made sure all seals were correct, still nothing but issues. i tried to reach out to sinister diesel about this but they were no help.
EDIT- sinister diesel finally reached out to me and was willing to work with me. I exchanged the adjustable version of the blue spring kit for the standard version. It works great, like it should and I am much happier now. I changed my review from one star to three. I do think sinister diesel has good products, I just wish they were more willing to work with customers without customers having to leave bad reviews.
Reply from Sinister Diesel2026-05-26
Hi Adam, we are glad to hear that you are happy with the resolution and it sucks that you felt like you had to leave a negative review to be heard. That is not our normal process. We closely monitor our reviews to catch anyone that may have slipped through the cracks. We strive to give each customer a 5-star experience, unfortunately we some times fall short. We never want you feel like you have to leave us a negative review to get our attention. We work to answer every call/email/help center request in a timely manner and will continue to improve the process.
Thank you for the review. Glad the ordering process and shipping were smooth. We appreciate you choosing Sinister Diesel.
R
Randall · 6 reviews · Experienced 2026-04-08 ·
★★★★★
Great customer service
Reply from Sinister Diesel2026-04-29
We appreciate the review. Glad our team took good care of you. Thank you for choosing Sinister Diesel.
J
Jason · 1 review · Experienced 2026-04-25 ·
★★★★★
Great product.
Reply from Sinister Diesel2026-04-27
Appreciate the feedback. Glad you’re happy with it. Thanks for choosing Sinister Diesel!
T
Troy · 3 reviews · Experienced 2026-04-16 ·
★★★★★
Customer Service is top notch and so…
Customer Service is top notch and so are the products you sell. I appreciate that when a person has a question, problem or needs guidance you answer the call and take care of it. This is what good companies do.
Reply from Sinister Diesel2026-04-20
Thank you, that means a lot. Taking care of customers and being available when it matters is something we take seriously. We appreciate your support and your business.
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