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Many like the Volant model, Mopar is another option and then K&N. Tuners you know have a choice of Diablo which actually puts a modified tune in the computer or the Hypertech Interceptor that plugs in-between 4 different sensors and improves the performance by altering the signals the motor see. Diablo has many more parameters to alter but it also leaves a foot print in the computer and some are concerned about warranty.