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Is it possible to improve the rear of the chassis, e.g. the tank, spare wheel?
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It's always possible. The question is would you like living with the result.
For instance, one might remove the spare tire well, put a 90 degree elbow ahead of the muffler and run it laterally behind that crossmember between the struts to exit on the other side.
Then you could ramp the diffuser from [ahead of] the crossmember itself.