I made the mistake of swapping my 12" resonated FI x-pipe for a non-resonated x-pipe. The sound was louder but the drone was unbearable. My wife and I couldn't communicate while I was driving. Plus the drone was causing me headaches. So I had a shop weld some resonators on my x-pipe; problem solved. I went with 10" resonators this time. A little bit louder than the original and the sound is fantastic.
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'13 370Z Midnight Blue 6MT / Touring Sport w/nav / PPE Long Tube Racing Headers / FI TDX 10" Resonator w/CF mufflers / K&N Drop-Ins / ZSpeed Underbody Shroud v2 / DRL 'always on' Mod
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