For lurkers, Thorley also makes smog legal headers, though they are pricey. Nice boost at 3-4K rpm, which is right where you are if you downshift to pass at highway speeds. Added 10-15HP to my truck - basically about as much as you'd lose running AC for a comparison - heh - but *just* enough to get up hills in 5th at 60-65mph. Don't expect a header to do amazing things in such a small engine.
Way lower heat. Tons easier to get at all the stuff on that side of the engine as well. Exhaust sounds properly aggressive - like half of a V8 instead of a lawnmower. But... yeah, expensive... Def find new old stock or used if you can. Thorley makes great sutff but it's not cheap.
