I'm looking at moving to an M6 GC from my RS5. I have the Eventuri on my RS5 and it is amazing how much power it makes. Is suggest reading some of their propaganda - they have a solid reputation for making good power (20-30hp) legitimately and independently tested on previous NA M cars. A bunch of us got them to apply it to the RS5 and the results held up - guys are doing independent dynos getting about 20-25 hp and about 20NM midrange torque increases. The reason is their use of the Venturi effect laminar flow concept - very different from any other intake system.
If I do step into a M6 I'll get one ASAP hands down. Worth every penny. Especially when you consider what is being dropped on Akra/MSport exhausts. And I'm not even mentioning how sexy it looks. I'm not sure what their gains are on FI cars but I imagine with a tune you could be looking at a lot of power.
Here's my engine bay before and after.
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