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Go to a speedometer shop, there are several around here, some mechanics have the set-up too... they put the car on rollers and check the speedo at various speeds, I've had my 300C on it and tested up until 90mph. They can make adjustments if it is off and/or let you know exactly what the difference may be.
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Visual:
E&G Heavy Mesh Grille
35% (True Grey) Tint
Altezza (LED) Red Taillights
7000 HILITE Xenon Fogs
Color Matched Pillars (not in pic)
Performance:
Borla Cat-Back (#140112)
SRT Wheels on Toyo Proxes ST 275/40R20 Tires
Volant CAI
Diablo Predator
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