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An exhaust is a performance altering item. If they were going to include it they would probably have been testing it. Things like the power bulge can be added in last minute and not alter performance. The m5 has quads in its test mules...
On top of that, i think they need to maintain the quads on the m3 as a point to upsell from the m1 to the m3. The m1 is the "baby M" per se. Plus the chassis is so small already.
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