[Todd Hedges]

They will check brake bias, clearances around break lines, fuel lines, etc., that the battery is secure, seat belts, wipers, defroster, high/low beam lights, park brake, steering play, shock quality, end play on wheels, check for loose fasteners.

There are some savvy ways to play with the noise issue.
A tightly coiled piece of 4" wide - wire mesh temporarily secured in the side pipe will cut down on the noise.

The car looks nice from the photos. If everything is tight, secure, and it looks like it was put together by someone with skill, which is 60% of the process. If there are easy pickings for them to find, they will look harder.

Best of luck.
See ya out there.