What's the best affordable way to upgrade my engine
2 Answers
Buy a better car. You could spend a lot of money on your engine and still be way slower than a V8 car or even a newer V6.
I agree. The 3.1 doesn't give you much to work with. Sell it and buy a GTP. That gives you performance right out of the box and there are lots of aftermarket things you can do to it that must make it better.