I would say, I quite impressed with this mod really !!
but perhaps on my point to comment when driving around Fern Bay Green, your car perhaps too much downforce compared on how your engine produce power
and perhaps the handling will be improved if you change the suspension setup from MacPherson Strut to double wishbone (IMHO)
from 3D model wise, I would say, that's quite ricer and also weird when 4 cyl engine have 2 muffler, perhaps you need to delete one of each, or having only one on the center of bumper just like Honda HSV, or you could change the engine into like V6 or V8 so the 2 muffler still make sense
great job, I've started one but seeing this I think it's better wait for yours to complete