Sinister Diesel Reviews 

Online- spot on
Order arrived in timely manner

Easy to find the part, really should not have went out in the first place. But glad they had it. It was the on an off valve for the water filter. Was leaking. Poor construction is all I can think, plastic ball valve. Got 3 years out the older one. The price you pay for this stuff should be made unbeatable.

The part was direct fit and easier to bolt on than factory style. No issues with shipping. Happy to do business with you every time so far.

Not the greatest customer service. Had to call twice for order issues. First time I called they were rude second time I called was better. Parts I ordered had no real change in performance. More for just color and look under the hood.

Great quality products at competitive prices

Great customer service. Received part in a timely manner in good conditions. Core return was posted sooner than expected

My experience with sinesterdiesel was a positive experience highlighting their attentiveness, quick delivery, and helpful service.Only issue/problem I had was with the clap that came with my cold charge pipe. It doesn’t stay around to lock.

Quick shipping on my egr and cooler kit. Kit saved me about 800$ over mechanics sourcing of parts.

Tuner purchase never came

I purchased a tuner early during the week with express shipping , customer service didn’t help at all . Canceled purchase

I received my package on a well manner time frame an it was well packaged. Looking forward to doing more shopping for diesel parts.

Great Products, shipping, and service!

going on the 5th business day now since i placed an order, and it still hasnt shipped. i even paid the extra cost for 2 day shipping. if i would have known it takes you guys a WEEK to ship out i wouldnt have wasted my money on the priority shipping.

degas bottle not fit for 6.0. send back. not full refund -$70
exhaust manifold was stolen. no refund. no replacement.
customer service (Marsha Eubank) HORRIBLE. didn`t help any.
never had such a bad service. work before with AFE power, Mishimoto and Banks never had a problem like that

Should read reviews before..

I spent so much money with these people
I ordered parts never received them. I have pictures from the delivery. It was delivered to the wrong house maybe make a police report and they still haven’t sent me my new parts or a refund so I can go buy somewhere else. I’m about to throw away all the junk I’ve ever bought from them Which I’ve had problems with Patty of times.

Been two days for a next day air item and still havent recieved a tracking number. Ordered many parts from riffraff and summit, recieved a tracking number almost immediatley and recieved all parts on time. Whether i recieve my item or not it will be the first and last time i make a purchase with sinister.

The customer service experience, the products sinister diesel is the best diesel performance

my family and I have spent a ton of money with sinister for our 6.0/7.3 powerstrokes, from turbos, to exhausts, to internal engine parts.

I contacted them the other day on possibly seeing warranty period for their oil/coolant filtration system kits, the bracket had a developed a crack in it over the past few years from vibration and harshness of a 6.0 engine bay.

got in touch with Rebecca in their customer service via chat and via phone call. honestly she’s been the EASIEST customer service rep of a big performance parts company I’ve ever dealt with in my 12yrs of automotive performance/repair career.

she went out of her way even at closing time (sorry for running you around Rebecca) to my old order history to see what all I’ve replaced on the truck that I couldn’t find the paperwork for. even offered me some swag and discount codes for being a loyal customer, and all this offered over a warranty parts call!

I’ll be spending my next $1k toy truck budget with these guys again. haters will say it’s photoshopped, but I’ve had nothing but good customer service experience and purchase experience with sinister diesel. you get out what you put in when it comes to customer service and wanting help on warranty repairs/parts in this industry. treat people the way you want to be treated.

Jamie a.

I bought a Sinister Diesel IDM. Less than 2,000 miles later, I was stranded and incurred a $1700 bill to have the truck towed and the IDM replaced. Sinister would not honor the warranty because I didn’t have the diagnosis soon enough! When I called, Sinister said this happens and didn’t apologize or offer me anything except 15% off! I have now removed all their garbage from my truck and will never buy another junk product from them. Save yourself and avoid this company entirely! Poor products and no warranty = fraudsters.

I have nothing to say bad about Sinister Diesel the product I ordered was shipped and arrived when they said it would and on time, there was as advertised, good quality and workmanship, A+ in my book good job Sinister Diesel.👍