I purchased the SINISTER 7.3 Intake Elbow W/ Boots Kit. The only thing that I didn't like but I knew about before I ordered. Was that the kit doesn't come with the boots pictured. It comes with the up... See more
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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.
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United States
- sinisterdiesel.com
Replied to 66% of negative reviews
Typically replies within 48 hours
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Part arrived in the expected time was…
Part arrived in the expected time was correct part. Installed easily and appears to be functioning as advertised
Grea follow up
Great follow up on an issue I had with installation. It was refreshing when a company really has customer service.
Promo codes cannot by used with points…
Promo codes cannot by used with points earned from previous purchases.

Reply from Sinister Diesel
Purchase experience was super efficient…
Purchase experience was super efficient and the products were delivered as expected.
Once installed, the products work and look amazing!
Great greatprice great quality great…
Great price great quality great customer service
Great Customer Service. Reputable Business
Thank you for the honest and speedy reply. I expect that from a reputable business and very much appreciate it. I only wish you had an engine cover to fit my motor. Let me know if you decide to fabricate one for my vehicle. You have fine products. I appreciate the sincere call from Katie and adjusted my rating accordingly.
Original Post
I ordered an engine cover for my 1999 7.3L Powerstroke Ford F250 XLT. Got the part in a reasonable amount of time. It looked amazing and very well built. It didn't come close to fitting my motor. Tried calling customer service CS and was prompted to use the contact us link. I received an RMA in an email with instructions. I mailed it back at my expense ($57) requesting an exchange. I sent another note in the same fashion due to no mention of exchange. Katie
from CS called and left a message that this part did not fit early 1999 model years. Their website part description states, in part .."Fits 1999-2003 Powerstroke." I called Katie back and asked for a "return shipping" refund since this was not my mistake. She said no. Great product, poor return policy for legitimate returns.

Reply from Sinister Diesel
Received quickly
Received quickly, mechanic put it in, working great so far

Reply from Sinister Diesel
THE BEST LOOK….
I truly love what sinister diesels product did for the performance and appearance of my motor…Looking to purchase more…

Reply from Sinister Diesel
Great products!
Easy installation. Great durable product.
Great installation guide. Seems durable. Better coolant protection.

Reply from Sinister Diesel
Satisfied customer
I was pleased with my purchase and customer service was excellent.

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Top notch product and top notch…
Top notch product and top notch customer service! I was told originally that my turbo could be a 3-4 week wait but recieved it in about 2 weeks. Beautiful product that performs just as good as it looks!

Reply from Sinister Diesel
Parts ordered were packed well i…
Parts ordered were packed well i protective packaging and shipped quickly. Received everything in approximately 4 days in very good condition, all parts fit exactly and were very easy to install. Degas tank and coolant bypass filter kit both installed in less than an hour! Very pleased with the materials and workmanship on the parts, they look great. Will be making more upgrades to my 6.0L soon using Sinister Diesel parts!

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I had a part missing
I had a part missing, and it was immediately shipped upon request.

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