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I've never noticed any issues. Axle back/muffler deletes are usually what I run on all of my cars (including 2 evo's), and honestly I've never seen a performance gain or decrease.
As for levels, the ones I've heard:
Stock: 5
Works A-B: 7
Single berk (no resonator): 8
Single berk, with catless front: 9.5
Dual berk: 10
The dual berk also has a pretty decent resonance right around 2000rpm. I've learned to just avoid speeds that are at that RPM in a specific gear. The Works doesn't seem to have any from my friend's car though.
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