Am planning to replace my current exhaust system to a free flow exhaust. Needed your inputs if it will affect mileage which is already not so good as its a 15 year old car. I already have a k&n performance air filter installed.
I am not looking for a loud sound but need to improve the performance of the engine.
Unlikely to make a huge difference in performance on such an old engine. You may be better off leaving it be so the car’s resale value isn’t affected. SVP