Quote:
Originally Posted by bfrank1972
Actually if you read through the forums (look up shiv & crawford blocks, or moto mike and power blocks) they make a pretty big impact when tuned correctly (even on E85, though they tend to work optimally with pump). It's just tuning of runner lengths, nothing more. Up to you on whether to skip out on them or not - I have a set ready to install 
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This. I had them installed before going E85 and adding a low profile strut tower brace that wouldn't clear the higher IM. The BPBs with or without a tune make a noticeable difference on 93. They make the car feel the way it should have stock.