There you go, passing the inspection is more important to you than the "loud as piss" factor. I'm sure you'll like your SLPs! Do what works best for you.
What I got was the Bassani 5-piece kit, which has both o/r legs and comp cats, which can be swapped out pretty easily. I run the o/r legs, and it's loud...real loud. I love the sound (it's paired up with a Magnaflow axle-back). It worked best for me, because all I wanted was the sound - I have no idea if there was a performance gain.
If you can, give us a sound clip of your new set-up once you get it on!!