The default muffler is great! It is not mandatory to change it, since it performed quite well. I buy the caliber 2 second hand together with these 2 mufflers, so why not mount them?
Hatori 3d pipe 350
A must if you run with high nitro percentage.
Require to use the additional parts provided in kit.
Hatori Mufler 337
Not really interesting compare to the default muffler, except that it is lighter. Replace the default muffler with no change.

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