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Sorry about my og comment (get a v8) I read tunes in the title and thought music. Then you mentioned mufflers and I thought you were looking for a good sound to, as you said "think twice before wanting to race my car." An ECU tune won't warn anyone about you before the race, just surprise them while you race.
But again, overkill is the only tune to get unless you know a good dyno tuner. They offer a kit that allows you to use E85 and can really help.
Someone said long tube headers, but the 2015 cant have headers, so just worry about the intake side. The jackfab spacer and manifold did much more for me than the CAI, but they all help.
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