Don't rely on ECS Tuning application guide Based upon website guidance, I ordered an auxiliary input wiring harness for my 2003 Mercedes C240. I received it, decided to do some online verification before opening the package. I learned this harness wasn't compatible with my car's wiring. After a lot of hassles I was authorized to return it. I paid shipping both ways for a part incorrect for my car, despite the website claim it would work.

A very satisfied customer Placed an order through customer service. When my parts came it was the wrong parts. When I called to explain, the customer service representative was incredibly helpful and corrected my order and sent the correct parts at no cost to me. I cannot go wrong ordering parts through ECS. They're experienced, courteous and always willing to make their customers happy.

Great customer service hassle free Great customer service hassle free. My package showed up missing two small parts, was shipped replacements the same day. Pretty certain that FedEx was to blame, but ECS didn't make me go through that dreadful claim process. Very thankful for the customer service.

Worst company ever , DONT BUY ANYTHING Worst company ever Should be out of business Worst customer service in history Waited over 2 weeks to receive the wrong part Then another week or so trying to talk to somone in there customer service team (they dont answer the phones or email back) Its now been over a month and i have had to fix there mistake myself I dont EVER write reviews EVER unless im that satisfied with customer service for example ARM is above and beyond with there customer service and shipping speeds I went ahead and made this review to show how awefull they are Im that mad and dissatisfied that i wrote a review on every single option to leave a review on This is beyond a disgrace of a company

Great service and fair pricing Great service and fair pricing. Love the lifetime warranty.