I have tried the B44 undertray on my BJ4WE and it's a direct fit except towards the rear. You'll have to a little creative to bolt it down towards the rear, unless you run some T-Bone Racing bumpers in the rear.
I also bought the Pro-Line Vortex body for the B44 for my BJ4WE. It's a direct fit, and comes with an undertray and a wing. Since my old B44 undertray got chewed up, I'm glad that proline threw it in with their vortex body.
IMO, the styling isn't as sleek as my stock Illuzion body that came with the BJ4WE kit, but it comes with an undertray and a wing, both of which needed some replacing on my ride...
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