Which road u use?
Feels on the same road or different road also can feel?

Stock is the best for comfortable ride...

one of my customer kena tahan before, but thats bcoz using cheap HID (the light kinda 'green' ), officer check under hood but cant find the ballast.
he said got problem with the bulb..  .. so lepas, no problem.. hehe

but depends on ur luck also.. 

mine is R3 CPS 
Can't find roads that long enough for me to reach that speed and I don't have balls of steel to keep speeding more than 5-10 mins  You using 15 inch right? Maybe that's the reason you can achieve 180 km/h. I have changed to R3 ECU+R3 exhaust+Manifold but still can't reach the desire top speed 

I think non CPS Campro have no problem to reach 180 and above because my fren 1.3 non cps auto oso can reach 190+. The CPS auto is the problem one 

when driving, the noise is very minimal or no noise at all, but loud when car is parked.
since yesterday evening, few days ago heavy rain, drove thru a few deep puddles at around 40-60km/h, that might be the cause? 

actually there's another problem since months ago.. sometimes when driving slow (and normally is when car still cold after stopped for some time) can hear a soft 'klurk klurk klurk' noise when going slow, going str8 or turn the noise also there, searched for similar thread .. but can't help much .. when send for servicing the mech cant detect also, maybe cus it's still not tat serious so visually they cant tel which part is wearing out? when the mech test drove he say no problem also