The ARMA speed is an excellent option if you are looking for a carbon fiber intake.
If you do not care about carbon fiber and your concern is the sound, Injen is the loudest.
If you are interested in trying it, im more than happy to offer a more significant discount in return for your honest feedback on the forums.
Current ETA is 04/20
It's not about the CEL count but more about the quality of the cats used.
Evolution Racewerks use generic cats, just like every other brand on the market.
Active Autowerke use EPA approved GESI cats that do not trigger the check engine light
The most significant difference is the check engine light. You will eventually get the CEL with the evolution Racewerks.
The active autowerke downpipe is the only that's offered with a no CEL guarantee.
We offer the evolution racewerks with ceramic coating.
If you are a track user, it's an excellent investment. I don't think the coating is worth the investment if the car is mainly a street car.
From all the data posted, the gains are the same with high-quality catted downpipes & catless on the stock turbo.
I only see a significant difference in power when running larger turbos.