try to avoid hi-to-lo stuff la if can. my experince with tht stuff not good at all. will produce hissing sound. unless u change to very very expensive hi-to-lo maybe will no thave this problem la
dude i have own a engine where runnig turbo dvvt system
i have add on an e-manage system
in terms of igination n timing can't be use/control following by the tuner/installer tell