Best is quite subjective and really depends on other factors.
If you don't care about cats, there are numerous options including Miltek, AMS and a few options on ebay.
If you want APR Stage II, then the APR DPs are an interesting option due to inclusion of the stage II file.
If you get an exhaust you don't want to cut (Akrapovik for example) then you're either limited to AMS, Miltek, Ebay, or if you want APR, you have to pay for customization.
If you need to pass emissions, CEL, whatever, and you aren't willing to hassle with spacers, etc then there are 3 options: Stock, AMS, Mike's from Russia.
I personally fall into the last category. I own Miltek and APR and I have to deal with a state inspection that requires not just that the CEL be off, but also that all the sensors are "ready state". This means they cannot be "tuned out" with a system like APR (or others). I do my own work, but am not willing to swap down pipes yearly. I have also hassled with 3 different spacer setups on several exhaust setups and not had one work reliably yet. <- Back luck I'm sure.
Given this, and after speaking extensively with Mike in Russia, I have purchased his downpipes and will be reporting back on them in the upcoming weeks as they compare against my miltek and APR setups. What I'm told: Uses the Same GESI UHO 300 cell cats used by AMS which are better than GESI HO 300 cell cats used by APR. Uses a more blended pipe inlet than AMS, but doesn't look as clean as the cast APR. Uses 2mm (.078" wall (.078") tube vs 1.6mm wall (.065) wall used by AMS. Fits in stock location just like AMS but crosses over engine as factory whereas AMS and APR both drop down the same side of the car. Mike guaranteed me no CEL and he offered me a 2 year no questions asked warranty. Advantage to my situation: no customization of anything, bolt in solution with my Akra exhaust, no spacers, no CEL, 2/3 cost of AMS triggered my interest.
Now, if they don't work as advertised that's a different story but based on my discussions with Mike I felt it low risk. We'll see.
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