There are some kind of noise restrictions. I've never been close to that loud of a car - so I'm not familiar with them. Sounds like Bill's exhaust tip would essentially be buried under the car pointing at a hollow area underneath and resonating throughout the car. So like he said it's probably quite loud inside the car, but not so much outside.
00 Toyota Celica GT
01 Audi A4 1.8T quattro
93 VW Corrado SLC VR6
72 Datsun 240Z
'10 & '11 Street Tire champ, '12 & '13 RTF champ at Tri-State Sports Car Council - www.TSSCC.org
'12 trophy GS - SCCA Solo Natls.