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  1. 2010-13 Mazdaspeed 3 Engine and Performance
    Hey guys I'll be going BT in a few months and i was looking to get a bigger core for my car. I see that mishimoto has a nice core that is 31"x12"x3" but the inlet/outlet is 3" and our piping is 2.5". Can use a reducer in both sides? is that something that can be done or is it better to get a...
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