Originally Posted by 1998 Ford Ranger
I want to put dual exhaust on my stock 98 4.0L. I know someone that has a 40 series flowmaster not magnaflow and was wondering if anyone has done that and if it will make mpg changes or performance? And how big of exhaust should i get?
You will gain dB, but not MPG or noticeable HP. Buy an exhaust for sound and looks, not performance.