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If you want EL, do a good catted long-tube EL header - there are a few, and a tune. You can get an OFT and use their free maps to pretty good effect. That will get you most of the gains. See how it sounds with your Borla, and then go from there (louder or quieter) by replacing the axle back or going full cat back (replacing front pipe will make it noticeably louder). I'm running just a catted EL header and axle back, and feel pretty substantial gains. Sounds awesome too.
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