Great place to buy diesel parts for your truck! Sinister MKM makes and sells high quality parts for diesel trucks. I've spent thousands of dollars with them and will continue to do so when needed. Shipping is kinda slow (and not cheap), but website is easy to use, and staff is fast and friendly! In my opinion, Sinister MKM should be every diesel truck owner's first place to shop for performance upgrades! I love these guys!!

Newly opened branch in Stirling.Great… Newly opened branch in Stirling.Great value ,great service.Although it was two small separate orders,the orders were professionally delt with by friendly staff ,and delivered without much problem under the present circumstances.Will definitely recommend and use you again

Horid! I am a business owner that specializes in building Cummins Diesels. Two of my trucks were down due to both transmissions going out on me. I ordered two Firepunk Tow Master Transmissions for a total of $8,000. My order was placed on the 7th January of 2014. The issues began when the leadtime was communicated to be two to three weeks which was acceptable. I took both of my trucks to a friends place of business to store temporarily until the transmissions were ready and delivered. There were no updates or communication on my $8,000 order until I called Sinister. When I called it was communicated that the transmissions will be ready the next week (WEEK 4). Week 4 arrives, no communication on my transmissions. I called Sinister again and I did not get any response to WHY my transmissions were ready. So I called Firepunk directly. Firepunk gave me all the information I needed which was very bad news. Sinister did not pay them (After Four Weeks) for my orders and would not start the build until paid. I then called Sinister and asked for one of the owners of the company, I needed to wait for a call back. No Call Back. So I called again and I was transferred to one of the managers. At this point I was quite PISSED because I just spent $8000 with a company that does not have any customer service. The manager stated that we are working on the payment issue. Bottomline the DAY of my complaint Firepunk was payed. Once payed Sinister did not give me information whats so over on ETA on my builds. After many tries I gave up on Sinister and just worked with Firepunk on the ETA's etc. Once the builds were complete on my trannies Sinister did not call me to schedule the loads. Instead I coordinated with Firepunk. Once the Trannies arrived I coordinated with Firepunk to return my cores to get my $2,000 back. Still no communication from Firepunk. When the cores arrived to Firepunk and credit was issued I called Sinister to initiate my $2000 back. So in summary: Sinister FAILED in every aspect on a $8000 order and the personal at Sinister did not care whats so ever of the issues. After EIGHT weeks and after a loss of business I finally had my trucks up and running. If I ran my business like this I would be out of business. Customer Service 101 - Just remember when a customer is happy they will tell a few people of their satisfaction, but when they had a horrible experience they will tell everyone they can about it. James Bigley 210-241-9496

WASHING POTS IN OUR NEW BATHROOMIS NOT WHAT WE WAS EXPECTING WHEN WE ORDERED OUR KITCHEN FROM MKM:Having ordered our kitchen from here we … Having ordered our kitchen from here we were very excited when it arrived but unfortunatly thats when the problems started our fitter was all ready to go but was held up because the wrong sink was sent we ended up with no sink and no washing machine for two weeks our designer never took into consideration where the stop tap is situated therfore we had to get a plumber in to rework all the pipework as the washer had to be moved from the original design due to the afore mentioned.The fixtures and fittings for the sink were also wrong and had to be sent back delaying us even further what should have been a simple and straight forward job has turned into a nightmare causing us a great deal of upset and distress.Having said that the quality of the kitchen units are superb although one of the work services came damaged and we were missing a end board.And the underlights are missing .

the pipe was a poor "fit" All motors cant be expected to be identical but the y pipe from sinister I received was way off and very poor fitting. I ended up using prybars and a ratchet strap to get the last flange bolted. I'm pretty sure it broke all ready with all the exhaust I'm getting in the cab and the six lbs boost I'm loosing cant wait to re do that crappy job again!