I'm driving a proton car which has factory equipped airbag steering. After a few years, I changed to a 2nd hand momo since the leather of the airbag steering started to peel off badly. I tried to find a decent steering re-wrap shop but to no avail. The quality simply won't match as the stock steering.
So I bought 2nd hand aftermarket steering and get it installed at acc shop. Bosskit? Using capalang bosskit sold by the shop. I saw the workmanshio myself. First, they took off the front cover of the airbag and some wires connected to the airbag. There were only 2-3 wires if I'm not mistaken. Then, took off the whole steering.. install the capalang bosskit and finally the aftermarket steering. I keep the old steering under my bed at home. 1-2 months later I bought 2nd hand lancer/evo bosskit since the plastic cover of that capalang bosskit has gone soft and some weird sound came out as I turn the steering wheel while driving.
Just buy a 2nd hand evo bosskit and bring your aftermarket steering to your favorite acc shop. They should know what to do. There are a lot of sgti's out there using aftermarket steering w/o any prob.