RomRaider

As I already posted. I pressure tested all intake from turbo to engine. At 1.2 bar there was no leak sound. At this pressure, I think it is easy to hear some leaks, because same story with afr was when I tried running 0.7 bar at wot

Also, forgot to mension. Due to maf wire length, I turned housing with maf anticlockwise, so maf sits not at 12 o'clock like in stock, but about at 9 o'clock. Does it affect something?

not sure how you pressure tested after the throttle plate but ... ok

You pump air to the intake and it also goes to intake manifold. If I would have leak in intake manifold, I would have leaner afr and big fuel trims at idle. I had one leak on fpr vacuum pipe, so I know what happens

OK just so that I follow this properly, you have an induciton kit fitted, have rescaled MAF so your AFR's are matching your target and the problem is your MAF volts are much higher than you expect is that correct? I've seen this before with the mishimoto intake, do you have another brand intake available to you otherwise look at a speed density conversion so your not capped by the high MAF volts.

My only concern is that with mishimoto kit, my MAF scale is about 10-14% lower than stock, is it even possible or should I search somewhere else? My MAF with housing is currently not in stock 12 o'clock position, but in 9 o'clock position due to length of the wires. I leak tested all post turbo lines, changed one cracked vacuum line, leak tested again and the only thing I hear is a really deep hissing in intake manifold area, as if air escapes through valves(???) The only thing I can do is to cut stock housing from air box, mount it and see what happens. I plan to go to SD, but before that I wanted to properly tune my car on maf, so that transition to SD would be less pain

with a front mount on you should still be able to fit the top half of the stock airbox with an airfilter taped into it as a temporary test. If the car drives as normal with the stock airbox/stock scaling then refit the intake and scale the maf until the AFR is back where it should be. Whatever figures it lands on must be correct then be it bigger or smaller.