Berk's have a less dense cell count than some others, which means they have the potential for more flow. The trade-off is that it doesn't function as well as an actual catalyst, but if you are planning on doing this, you probably don't really care much about that.
Also, Berk's have a pretty good track record of no CELs.
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2012 Mercedes C63 AMG P31 Sedan, ROW, aFe, Eurocharged Dyno Tune. 438WHP/415WTQ
2010 SOLD: 40th Anniversary 370z
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