What are some basic things I can do enhance performance in my 93 sc 300 without major modifications. I have heard people using mobile 1 engine oil, is it than castrol syntec i have been using.

 

get a importtoys intake setup!

the adapter is $25 and you can find a generic filter for $30 or so too; importtoys sells the filter too although i'm not sure of the price; its where i got my adapter from

a custom cat-back exhaust wouldn't hurt either; getting them custom bent is much cheaper than buying an exhaust retail (but they aren't quite as nice; but its more of a issue of $250 vs $800

i always run mobil 1 oil

if you've got a 5-speed tranny, redline tranny fluid helps a lot too

 

please see my response to this in your other post on the same topic.

I agree with Bean, however.