Stillen gen 3's arriving this Saturday :)
I'm finally installing the Gen 3's this weekend! I'm gonna follow a DIY I found on here. There's a couple questions I have that I couldn't find on this forum. 1. Does this give 18whp without a tune? Or do you HAVE to have a tune for that increased power it gives? 2. Will water from rain or washing the car give the filters problems?
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