Sinister Diesel Reviews 

For my package and was missing parts so I called customer service and got Brian who next day air shipped what I needed but upon assembling the kit there was a damaged ball valve that had a slight oval shape due to being mushed by something, I called again and got Brian again, this is a good company even with me being frustrated they still bent over backward and have now next day aired more replacement parts absolutely taking a bath in the shipping to make me happy, I’ll definitely be buying the rest of what I need from here simply because they have great customer service.

I placed my order and a Friday and by Tuesday I had it on my door step. The installation process was easy with the instructions provided. I did have to rewire the mass flow air sensor, but other then that it was an easy install. Took me roughly 45 minutes. The air intake looks great and performs great.

The instructions were great! That little plug in the top of the head was TIGHT!! But a cheater and some PB blaster did the trick.

They have a promised shipping window and it far exceeded that. Other than shipping issues, no problems

They had the part I needed in stock and it was delivered fast.

I ordered the coolant filter kit for a 2006 Cummins. The box arrived without the aluminum filter block. Sinister responded to my email right away and shipped one out same day, so great customer service. Kit was very high quality.

So far so good. Haven’t installed it yet though

Everything

i didn't know the part was on backorder till after I ordered it, that being said they had it to me before the time they said I would after backorder.

Product looks great👍

Received in timely manner and was exactly what I ordered

I bought a blemished exhaust tip. It does what it needs to but an accurate description of the blemished part would have been great not a generic pic that’s not helpful at all

Great price and very helpful product

Everything was as advertised. No issues and it fit perfectly!

product did not fit as perfect as the price reflected i thought i need to tweek the mounting bracket more then i should have to insert into the mounting hole of the removed air filter. still not sure how long the tube will stay on the air intake with the close radius also. time will tell

Quick delivery and great product!

Order was a little wonky at first but they did everything to make it right. Parts work great!

The website is user friendly, product selection is great, prices are competitive and the parts I ordered shipped without delay. I’ll definitely be ordering again from y’all soon.

The ordering and shipping process was super easy and they delivered as promised. Haven't installed the pipe yet, bit thats coming soon amd I'm expecting good things!

Part arrived in the expected time was correct part. Installed easily and appears to be functioning as advertised

Great follow up on an issue I had with installation. It was refreshing when a company really has customer service.