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Alby_da_Wolf said:
About future additions: can you fit a 3-litre L-6 under GT86 hood? And if you can, won't it quite raise and shift forward the car's barycentre compared to the original boxer?

The boxer engines pretty huge, so a LOT of engines will fit with little modification needed, mostly to the firewall / tunel to accomodate a different gearbox and drivetrain.

If you are lowing the car (I am) the weight shift difference is less pronounced but you are still going to be in a situation where most engines you swap in for more power are going to have the effect of adjusting the balance and increasing weight, after all thats the reason they used a boxer engine in the first place.

With good planning, adjustment to the chassis, the proper rigidity upgrades and suspension configuration the negative affects can be minimalized, with the obvious bonus of pushing an extra 200 or so hp untuned depending on the selected engine.