Sinister DieselReviews 54

They had the cold air intake I wanted, and expedited shipping to get it to me on time to get it on my truck to complete a job I was having done. Nice guys, too!

I purchased a 250 amp Sinister Diesel alternator that only lasted 8 months after it was installed. Even though it was past the purchase date not the installation date they were willing to make it right. Now after them sending me 4 wrong alternators. They don't know what to do so I'm playing the waiting game. The old style alternator is no longer available and the new style will not work on a 2007 Chevy Duramax Lt classic. The owner said he will make it right. So will see.

If you are looking for the best replacement up pipes for your 7.3 Powerstroke then these are it. Excellent quality, Stainless Steel design with heat wrap. Excellent fit and replacement or original Ford. No more slide clamps to leak. Welded ends to fit properly and beautiful welds.

I ordered the blue spring kit over the weekend and it shipped on Monday. I received it on Tuesday night and had it installed that same night. Shipping was super fast and the kit was excellent quality. I would definitely order again from them.

Easy search bars easy navigation. I despise computers and online shopping. I will usually use in store service to order my parts they don't carry. This was simple. Ordered ebp sensor, pigtail and blue spring upgrade for fuel all fit like a charm. Seem to be working as well.

Product is great, arrived just as expected. Only slight issue is the installation instructions were online. Made it a little difficult to go back and forth to view.

Always a pleasure doing business with sinister. Great customer service. My go to for diesel dress up and quality parts.

The installation was more difficult than I thought it would be, the design of the Sinister Diesel Cold Side Charge Pipe for 2011-2016 Ford Powerstroke 6.7L (Gray) is a two piece install and the factory plastic design was three piece. Getting the top metal charge pipe to fit into the lower hose and then sliding the metal end onto the discharge port of the turbo was a nightmare but I (72 year old geezer) got it done in about 2 1/2 hours. If I had to do it again, I could do it in half the time with my learned mistakes. I will say that, once installed, I realized that the old plastic pipe must have been leaking for some time. I immediately noticed a huge improvement in performance and boost was easily 25% increased with acceleration. I think the plastic had been deteriorating for a long time with small leaks likely impacting boost. Very happy with the end product but wish the install had consisted of three pieces with an intermediate hose that would have greatly simplified installation.