Here is the claim:
Now you would think the highest horsepower level ever achieved thus far on the F10 M5 would be big news. Notice the 0 facebook shares? Notice how nobody is talking about this? Well this site doesn't just let BS like this fly and people get taken advantage of.
How do you post such monumental tuning news without a dynograph? Without a picture? At least show an M5 with the post if you're trying to pull a fast one.
Choosing a realistic number to lie about is a good idea as well. The current F10 M5 and S63TU horsepower record is held by Switzer with a 604 wheel horsepower pull. That is with a piggyback tune, exhaust system, and filters. ECU Tuning Group is claiming 666 wheel horsepower tune only. So only about ~145 wheel horsepower over stock without supporting mods and exceeding the highest number achieved by 62 wheel horsepower tune only.
To note, ECU Tuning Group has never been referenced on this website in regards to a dyno or performance tuning record. On any platform. Ever. The only time they are mentioned (before Singh Autosport changed their name to ECU Tuning Group and then called themselves #1 ) is when they make ridiculous unsubstantiated claims. Back in 2010 they claimed to be the first to reprogram the E71 X6M in North America also without a dynograph as support and after other tuners had shown dyno results with their tunes on the X6M months in advance. They at least had the decency to show a picture of an X6M with a laptop sitting in it that time though.
This website does not doubt ECU Tuning Group has tunes available. They may even have some tuning skill and merit. But this claim is just ridiculous nonsense designed to suck unsuspecting people in to be taken advantage of and this network will not stand idly by and not point it out like the others.
As a professional courtesy, BimmerBoost will gladly drive out to ETG's location in Los Angeles and pay for a dyno run on a Dynojet for an M5 with this tune. If ETG backs up their 666 wheel claim BimmerBoost will post a retraction, pay for dinner at the restaurant of ETG's choice, and offer a year of free sponsorship.
Will ECU Tuning Group accept this offer? Nope. Because they can't back this up. If they really hit 666 wheel horsepower there would be a graph and this would be all over the place. And Jags (the owner) no, a funky manipulated European dynograph doesn't count. Additionally, if you are posting European dynographs what actual tuning are you doing at your location in Beverly Hills? It raises a large question if the only dynos you share are European dynos as if someone else's software is being purchased and then resold at markup. Another tuner did this and also marketed with MAHA graphs when they were sourcing from a European tuner. Keep in mind, that by no means implies the software is bad as it's likely quite good. Just not 666 wheel record breaking never been seen before and never will be seen again good.
So what's the truth here? You go ahead and decide but it's not hard to see what is really going on.