Unless you upgrade the non-turbo with a....
wait for it....
wait for it...
TURBO!!!
In which case, don't get a N/A... it takes a lot more work to just get one safely ready for a turbo than it takes to just buy a turbo model and start upgrading.
Upgrades... well, bigger IC, new IC piping, larger injectors and fuel controller... But first you need to focus on fixing what's broken.
Yes, you can swap a 89+ bumper on to a pre89. You need the whole assembly if you want it all to bolt straight up... this includes the upper nose, the bumper skin the bumper support, the grills, turn signals, fog lights and mounts, and I think the fog light undercovers are different too. It's not fun trying to just make it work by mixing the parts up.
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