Damn, just read through this thread. Another monster being unleashed to the road soon.
Some things to add, stock internal actuator gate is a non-issue. Many people run internal gate and up boost no problem pun, with your engine and turbo, with stock manifold and internal gate, boost creep and spike is a non issue especially if you are running stock boost. Even if you were to up the boost to 1 bar or 1.2bar also should be a non-issue. On the exhaust part, the best exhaust is no exhaust, so I would suggest ditching the S flow muffler for a straight flow muffler, and upgrading the piping to 3" if possible especially the downpipe, go as large as you can on the downpipe.
Damn hardcore betul to soundproof the whole car, and sound system add la subwoofer. No woofer no kick no nice
Works gauge should be usable la, only downside is that it does not have a peak or alarm/warn feature like other digital gauges have which IMO is very important as one of the benefits to digital gauge is to have expanded functionalities like peak and alarm function as when you are going all out, you will rarely have time to check the gauges, with the warning function, once the reading had gone past a pre-determined setting, the meter will scream at you for attention. But since you already bought it, then pakai saja lorr.
Personally I don't really fancy sunroof, but as others had mentioned this is more of a personal choice thing.
On the Blow Off Valve, yes you are right that when using BOV, the BOV releases the air into the atmosphere whereas the stock recirc valve basically does the same thing but it vents the air back into the turbo inlet,
post Air Flow Sensor. Meaning if were to use a BOV, the ECU will think the air went into the engine and will inject the required fuel for that amount of air, but instead it is being released to the atmosphere, not entering the engine, but the ECU is still injecting that extra fuel. When this happens, many people encounter engine stalling issue, but if not mistaken in the e-manage I think there is a function to tune this out. So if you want to use a BOV, you better decide early so that you can enable that function in the emanage when you go for a tune.
All the best in your project! Maybe I can go have a look if I drop by Penang for work hehe