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To add, all cars get quieter after initial startup. Most of the time it's the CATS warming up, but also just in general the exhaust warming up too. My '69 Mustang is much louder on start up.
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1969 Pro-Touring MaCh 1 - CHP 427w 10.8 comp - 3140 lbs. - 460 rwhp / 490 rwtq
T56 Magnum || 14" 6 piston front / 13" 4 piston rear Wilwood brakes || Hydraulic clutch || 9" Detroit Locker || TCP Coilovers || Forgeline Wheels 18x10 275/35 front, 19x12 325/30 rear |