QUOTE(limcr @ Jun 21 2017, 10:00 PM)
Hi to all Mazda owner
I'm new to this thread, and currently i am interest to purchase a new car. i'm aiming at Mazda 3 GVC high spec & Honda civic turbo. i understand that civic is better in term of rear passenger space, but this is not really bother me that much, since i drive with my partner most of the time. My preference slightly slanted toward the new mazda 3 GVC.
My biggest concern with mazda 3 gvc as i heard from many youtube reviewer is the road noise. I heard that this new facelifted mazda 3 NVH is improved? Can anyone confirm that compare to pre-facelift version.
Can anyone provide me the sound level dB at 120 km/h speed. (Pre-facelift version also TQ

) and how's new honda civic sound dB at 120km/h also. Thx a lot in advance.
1 last question, can i improve the NVH of mazda 3 by purchasing a comfort tire? or is there any after market sound insulation modification? will this void my warrantly by installing additional sound insulation?
Sorry for all this noob question.
NVH and road noise, this is very subjective to individual. When I say it's ok, but you might feel it is noisy. As mentioned by Ginny88, best is test drive the car at your daily route. Compare both car side by side, end to end.
The original TOYO tires, are really noisy as hell. LOL.. But as you said, most of the time only you and your partner only, wouldn't be a concern then. Personally I found the road noise is on the loud side from rear passenger section. The driver and front passenger, is less affected. Though, I still rate the noise on the high side when compare to other same segment rivals.
Bear in mind, Mazda 3 uses 18" and thus thinner tire profile. Definitely it will create more noise. And, honestly, our car NVH is real bad.. Even my bro's persona also better, but Persona is using 15" and 55 profile tires, so that might contributed to less road noise and tires already absorbs and filter it.