I got my CBE at 1300 miles and when i tool her in for the first oil change at the dealership they all drooled over the sound it made. IMO breather mods dontt make a difference. But the intake... I would get one when the first ones are ready to be changed that way your not spending extra money on a barely used air filter. IMO of course. And yes it is hard not letting the RPMS go over 4K (what my dealer said till my first oil change) during the break in period, but im sure you dont want to replace the engine sooner than expected.
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