wei, guys don't be so lazy lah, type so little, where got so easy.
Joeker, take it from me else you'll regret.
Answer 1 - cannot do cheaply, if you do not accept this answer, sorry! God also cannot help you, prepare to waste money to learn big mistakes. Mistakes you'll only realise many years later.
Answer 2 - if you accept cannot do cheaply, then this is the solution
A) Get 4 throttles from BT only, do not and never ever get SVT - sure Fcuk-up - most of the time the user / tuner won't even know it, SVT 4 throttles is fundamentally wrong.
BT 4 throttles is perfect :)
Why? Because http://www.my-acoustic.com/Car/vacuum/4_throttles'_vacuum/4_throttles'_vacuum.htm
Something like that.
B) Make adaptor, piece of cake, pay machine shop to do. Go Ngai Sing. A bit pricy but guarantee good and no headache, no trouble-shooting, no downtime. Very important, this is to keep MORALE high without hiccup.
C) throw original ECU
D) Get stand-alone ECU, let veteran install and tune.
Done.
For all others, please don't tell me add this can add that can. Why?
Because at the end not smooth, cannot idle cun, power low rpm got, high rpm don't have, or vise versa, fuel economy sucks, pinging like mad, whatever shit.
I know you guys don't want to mention the sad things you guys experience. So you all know it doesn't work using the cheap way, so don't tell people can.
Creativity is good, but when creativity refuse to work in harmony with fundamentals, then thing will not work out right.