G15a in khyber needs alot of strengthening.
Like front mount used to break. So installed a nissan mount at back instead of a khyber mount, and then i installed timing, back, front, and two mounts on custom gear cross member and then we were able to get it stable on full throttle and frequent race driving..
Else on slow and steady speeds it had no troubles. Economy was 13/14 local, overall it was a pure sleeper like once its idling no one can tell its g15a inside.