having the headers ,free flow exhaust and an intake is good gains, 10% here 8% there really adds up for these little engines add a cam and expect another 5%,I installed LC eng. ceramic coated headers their cat back and cat delete K&N intake and RV cam in my 93' and felt a whole lot more bottom and mid range gains... good bolt on power for a stock engine.
it kills me how so many people will put tons of money into exhaust and air filters and everything and then install a RV cam.
no wonder it didnt show more top end and mid range
ITS NOT A RV