Re: Auxiliary air pump
I can't say with 100% certainty the pumps are the same internally? I just know that my superior Mercedes secondary air pump burned up when the relay stuck closed for about 10 minutes (to its credit, it also had 8 years of service). However, my potentially inferior Audi pump hung in there. When the relay stuck closed, the Audi pump was running for about 15 minutes; hot as a firecracker before I got pulled over in Houston traffic where I could safely unplug the pump; saving its life from an evil relay. After changing the relay my Audi pump runs fine. I was pretty proud of my research and decision to not pay the extra money for a Mercedes or a SRT-6 secondary air pump. I feel like a made the correct choice and got exactly the same pump but like you said there could be differences that I am not aware of. Even if there are subtle differences the Audi pump is a good and proven option for the less purist among us. I am only trying to offer my learning experience as a potential option.