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It's not "necessary" but if you look at the T1R exhaust it's only the axle back portion so the remainder of the piping would still be the stock size and that would minimize any gains coming from the exhaust mod.
If you are doing it for sound and looks and are not after any performance gains, the axle back portion will do fine, if you want best results both sections should be purchased.
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2008 VBP Fit LX M/T
3m clearbra
Keyless entry
Sport Spoiler
Zeta dead pedal
JDM centre console w/ armrest
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