The fast intentions resonated test pipes have no drone in the car and keep the deep tone. I know because I went from a set of non resonated to the resonated. I never had an issue with a check engine light being thrown ether. I'm not say the others are bad but the fast intentions test pipes are great and it's not a bad price either. I waited 6 weeks for mine but only put down a $100 deposit till they were finished.
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