1. I would never recommend any Mitsubishi to anybody, ever. 2. A 300Z will beat a 240SX any day of the week, almost regardless of mods. 3. The only difference a header would have for DOHC or SOHC is the amount it would let flow through, besides the fit of course.
"Why does it say paper jam when there is no paper jam?"-
Samir "Office Space"