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.

superb as always i have been using ECS for years and they always deliver quick and a very friendly staff. I have never had an issue with any orders and all the parts were as described.

Nothing about this transaction went… Nothing about this transaction went well. Ended up buying elsewhere, saving $300+, plus free overnight shipping. Weekend staff online worthless to solve issues. update; BS. I was asking why my payment was not processing, why I had no bonus points, why I could not use the $25 off (which processed the last time I tried) and why I always have trouble signing in... you should at least have read the text. But guess what, I'll probably still have to use y'all since you have bought everyone who supplies BMW parts, etc.

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.

Hard to find OEM+ oil for my b6 Audi S4… Hard to find OEM+ oil for my b6 Audi S4 avant, thank you.