Even parked with the engine off without proper installation which includes copious deadening and blocking off the leaky holes in the doors to create a more IB application your system will sound less than stellar. If you call that amazing, your definition is completely whacked. Stock speakers installed properly can outdo nice speakers in stock mounting regularly. I would assume from your post anmol that not only have you never deadened a car, but never been in one that has been done. Installation is the single most important part of a system by far and installation does NOT mean bolting new speakers in the stock locations. Proper speaking mounting requires a baffle, a vibration isolation layer for the baffle, door panel deadening (assuming door mount), sealing off the back wave of the speaker from the front wave, and aiming. Stock Civics sound loud as hell IMO.