1 the car might pass with out a new muffler, but yes you can have work done before u test.
2sounds like your talking about supertrap mufflers, they suck dont buy them
3not legal, if you need the stock intake for your test i can loan you my stock set up.
98 svt sil/blu 3.0 oval heads full P&P, msds headers,bat kit,2,1/2exhaust 30 inch glasspack and 2 spintech mufflers
14.78@94mph
with my mechanical arm i can shift gears in less then a twentieth of a second for sale $7000