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2015 SRT 392 A8 with 3:09 gears.
need help deciding between 305-35-18 and 305-45-18 regarding the 2 inch difference in height. Strictly for street nights at the track. Thoughts?
 

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Welcome to Challengertalk Matt ;)

A Guy
 

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2015 SRT 392 A8 with 3:09 gears.
need help deciding between 305-35-18 and 305-45-18 regarding the 2 inch difference in height. Strictly for street nights at the track. Thoughts?
Attend a session or two with the factory tires on the car. Observe what other participants are running and how well, or not, they do.
 

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the 305 / 45 - 18 is going to be a taller tire and is pretty much dead on the same size as your OEM 275/40 - 20 tires

the 305 / 35 with a smaller diameter, will effectively increase overall final drive ratio. This will give you more torque multiplication for launching, but you'll need to watch out for the likelihood of more wheelspin
 
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