Gotta make my decision like RIGHT NOW. got a magnaflow 14815 muffler and i need to choose what size piping i want. I have a k04 hammer file with all the supporting mods. the GIAC website says 2.5-3" piping. I was gonna go for 2.5in piping but now that i saw this im not sure anymore. Should i go larger? What do you guys think would be the absolute BEST for the k04. All my mods are in my sig. I was thinking of doing it without a resonator. Just piping from the cat back to the muffler. Too loud? i guess i could change it up later if its too loud.
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