Originally Posted by
Weq
It a pretty simple formula. Out Y1 is eqiv to a Z6. Y7 = Y4, Y8 = Y8. All the DOHCs are the same.
D's dont make 80kw without internal/cam change. All these mods ive seen dsicussed here;
headers
exhaust
intakes
leads
All they do is add bling and noise. You need an ECU to take advanatge of any of thee mods. Then the aim of the gain is to increase timing, lean it out a bit and tune it for 98+ron. But you arnt even going to make that much more power...
D-series NA is really really hard to do cheap on a budget without technical skills. First thing i would be doing is camshaft (zex 59300), ecu and cutting the bottom out of the airbox/SRI. With these mods, u will prolly pickup 10-15kw and the car will still sound/look stock. Maybe add a catback exhaust (2.25), but its going to add more noise then power.
From the discussion above re header types, its clearly evident that the OEM cast manifolds are basically as good as you will get.