I like the spoiler on that, its basically the Carrera GT. That sorta goes with 986 style.
But I don't think those intakes? outakes

under the tali lights work at all.
The fenders on the 986 have soft curves and I really don't like when I see
these hard Import Tuner-like features. I'd take that out for sure.
The best car to look at if you want to modify the rear end of a 986 is a 2000-20003 Ferrari 360. It doesn't have any of these gimicky features. It relies on the very subltle shapes and lines. I feel like the Boxster went a bit wimpy in this department for its front and rear bumpers in stock form.
Now another glaring problem with that car^
The Boxster is a sports car made for the twisties in top down fun.
That car looks like it wouldn't handle a full opposite lock turn for more
than two seconds before the rubber departed the alloy.
and those side skirts...

get them back on the SCION TC.