Is it bad if you just change the stock exhaust into a aftermarket one such as TRD or TSRM and not change the Intake into a aftermarket one such as Injen or AEM? because someone told me you have to change both.
I had the TRD exhaust on for about a week before I put my AEMCAI on and its fine to have it like that..you can notice a difference. I kno in my 6 speed it was a lil harder to drive due to the change in backpressure, but its cool.
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