customer service/ parts 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.

Quality Parts, Fast & Free Shipping We have ordered from Sinister Diesel before and I know it is a website we can trust to order from, and the parts arrive in just a couple of days. If we have any questions, it is easy to reach a person in customer service and they are knowledgeable about the products we are purchasing and are able to answer any questions we have. Maybe there are cheaper parts available on the web, but you get what you pay for and these parts are quality! Thank you!

My experience with sinesterdiesel was a… 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.

Defective 250 amp alternator UPDATE: Have to say they made this right. I was contacted by a rep and they replaced the item and paid for shipping to return the defective alternator. I couldn't be more pleased with the customer service! INTEGRITY!! I was given a 250 amp alternator for my birthday approx. 1 1/2 years ago. I wasn't able to install it until 8 months ago because I didn't have time to upgrade wiring. It died this week. $550 + for something that didn't last very long. I do not recommend this product. It's inferior.

High quality parts and an excellent… High quality parts and an excellent price! Fast shipping!