My 2015 on the Dyno 401 rw HP, with gibson muflers

[Rob WH]

only mode is cat back this car is premium with gt performance package.

Not even tuned then? That's nice, perhaps showing even more of a gap over the 2011-14 than claimed.

What did ya see before the exhaust, or did you hit the dyno all stock?

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[eleanor5oh]

Please do some 1/4 passes,
I have trouble believing all these magazines that only run 13.0@112 in the quarter.
400RWHP should be mid 12's. the old LS1 Fbody's that had ~300WRHP and similar weight would run low 13's.