With the DSE tubs it will be necassary to get into the frame. About an inch or so inch and quarter at the most.
If you don't want to cut the frame you can just cut the section between the tub and frame out. This is the section that houses the upper shock mount. It would be necassary to relocate them. You can then hammer the tub wider OR add a 1 1/2" section to the tub.
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