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I run open downpipe on my WRX over the summer and it is LOUD. The electronic cutout is basically the same thing when open, but you have the adjustabality to close it at anytime. Running the current map you are on would be fine, but a tune for the open exhaust would be ideal. In PA you can't pass inspection with a cutout though, but inspection depends what state you are in. When I run open downpipe I *think* feel a difference in power, but I am not sure there is actually an increase over my full 3" TBE and catless uppipe, if so I can't imagine more then a few HP or FT/LBS
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