I almost ALWAYS agree with RRR, however, every engine is different. From experience, 360 heads, bigger cam will flatten low end torque on a 318 if it has highway gears and a tight stall, and headers will do so even more. The new V6 cars have headers, but none of them have gobs of low end torque. They have more gears (giving them better gearing). For my '05 Pontiac with a 3.8 to take off like my 318 from a stop light, it will turn 3500 rpm's on shift point where my 318 would be turning 2500 rpm's. Now if you are talking a torque monster (440) or even a 360, then the benefit of headers comes in at a much lower rpm. Or a 4-speed car! Or a 2800 rpm stall with 3.55 gears! But for his driving habits, the headers are a pain not worth having, because he will not see the benefit of them.