Quote:
Originally Posted by Lotus7
The X3(F25) comes with (3) distinctly different exhaust systems.
The "throaty", louder system is delivered on 35i models only. It uses a "Dual-Path" muffler that uses a quieter path through the muffler for light load cruising and a direct "straight-through" path during start up, at large throttle openings, and during turbo boosted operation. A electronically controlled vacuum actuator switches the muffler path.
The 35i can get away with an almost direct exhaust because of the inherent noise reduction of the turbocharger's turbine housing.
The 28i, 30d and 35d models use a dual pipe, single path (always muffled) system.
The 20i and 20d models use a single pipe, single path (always muffled) system.
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Thanks for the post Lotus. I've had my car since April and its great to still be learning new things about it.