I'm not sure, I really like the way it sounds now. I think if I want a little more umph, I'd get their headers and leave Sec 2 alone. I liked the Dinan a lot by itself, but I wanted a little more from it and the RPI sec 1 has been a perfect addition. I also gained midrange torque and peak HP after installing the Sec 1 and doing pre and post dynos.
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