I run stillen cbe with stock cats. Perfect with no drone at highway rpm (~3k) and opens up at 4k vroooom.
In terms of hp numbers they are all relatively the same. It's like those how many different oranges do you see test. There is statically no difference.
Go to YouTube and listen to the different exhausts. Go to a local z meet (if you have them) and ask to hear people with exhausts.
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