.....until have to take a seat at the back of stream or wish ha ha

I did, but not sure your question.

DIY though...not easy as many things to take out until the you can access the roof.

No more ting tang sound when raining.

110-120 is anytime. for my Alza, getting to 140-150 is good enough for overtaking. (had little 'upgrade')

Yes, middle seat can further adjust the angle of leaning.  As I have 3rd row folded, I pushed 2nd row all the way back, many passenger can't believe the space even I sit quite quite behind based on correct hand length to steering. 

been 8 month now. i've notice something.

rattling noise on the left side of the dashboard. i couldn't pinpoint where it is but it is on the left side dashboard. it will only have rattling noise after you drive for a while like 30 minutes later. i wonder if it happen with temperature where some plastic/metal will expand and hit something that cause the rattling noise.

cabin noise is very little near to none except the left side dashboard.
i wonder if installing vehicle safety bar will improve cabin noise level to zero?

recently my car sway to the left.
i tried doing some test like letting go my steering while driving on a straight road, it will sway to the left.
i feel tired driving highway because it seem like i keep on focusing the steering to make it straight.
i already do alignment and wheel balancing the other day at perodua but it seem like it didn't help and charge me like rm52 + 16 for nitrogen >.<

currently i have no enchantment installed in my car. everything original.