You'd have to ask Lancer direct.

He has three cams to choose from, many combinations of carb jettings,
and it also depends on what intake and exhaust mods you carry our.

The stock airbox in well made for puttputting around town but is extremely restricted above 4500-5000 rpm - hence, you lose the last 1500-2000 rpm of the powerband.

All "headwork" must be done with a "holistic" approach: if you do "x" to the intake, the carb will need to be adjusted to suit, as will the exhaust.

Else, it'll be like testing an athlete's time against the clock by improving his breathing, omitting track shoes and even forgetting to don his track suit.

Brings back good memories from 1967, when I was a lightweight kid,.....ran the 1/4 mile 90 mph at 14.2 on a new stock 750 Norton Atlas. If my s40 would ever run like that now, it would be scaaaaaaary !
Who am I kidding ?? As it runs now, it scares me  !!