The M30 swap doesn't impact on the battery tray, so there's no impact on leaving the battery there. Most people shift it to the boot to help with weight distribution with the M30 up front.
When I did my swap, going from an M20 with AC and the battery in the front, to M30 with no AC and battery in the boot, I noticed little difference in weight distribution when driving the car.
When I did my swap, going from an M20 with AC and the battery in the front, to M30 with no AC and battery in the boot, I noticed little difference in weight distribution when driving the car.
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