Join Date: Aug 2009
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You don't need a tune or an AP to install a catback exhaust. It is advisable to replace the factory tune with a custom tune or a well tested stage 1 tune as the factory tune does tend to run lean under certain conditions, but this is totally independent of your CBE setup.
Basically, if you want a CBE installed you aren't going to hurt anything. If you install an aftermarket downpipe or full TBE you will need an accessport, tune, or some other form of engine management.
Whether a dealer could detect a non-factory tune depends entirely on their level of commitment to not performing warranty work.
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