Engine noise problem---appreciate the help

[NissanTumbler]

Couple questions first off I have a blk coupe 2.5s slight mods eyelids hid tint rims looks mostly about to start performance mods

Main Question #1:

stock engine right now and I live in SoCal and travel up and down a hill pass on freeway for some odd reason the engine winds on my way up the hill pass no idea why it's not screeching of the belt (brand new) and it's only when I step on the gas going up the hill pass and there after, I get back to home but quiets down when not under stress or heavy footed acceleration but is still present, driving around town I don't have any problems it's none existent HELP! THX

Secondary Question #2:

What suggestion type of exhaust should I install into ride I've seen axle back stillen but idk which I should buy?

[JCJPark]

sounds similar to the problem i was having with my car. I have a white 2.5S coupe with an axle back exhaust and the engine/transmission had a whining noise when it was under stress and heat. if your car is a cvt automatic, get it checked out at the dealership. it could be covered under the warranty, in my case, that wasnt the problem but i had to replace the cvt fluid. I also had to replace damaged cv boots/ axles and the drive belt. I haven't heard the noise since the repairs. if you have a manual trans, then maybe it could be the axle or cv joints?

[NissanTumbler]

Sounds about right I was low on transmission fluid a while ago guess Ill get it checked out thx

[BTUT5]

Yep sounds like a CVT problem. I believe that the CVT warranty goes till 120,000 miles (correct me if I'm wrong). But yeah head to the stearlership hopefully they will take care of you and probably do a flush and fluid replacement, I believe is the first course of action when it comes to the CVT.

[JCJPark]

If they say you need a fluid replacement, ask around for estimates before getting it done. You can probably get it done from a private mechanic for half the price, but make sure they use the OEM fluid, otherwise the warranty can be void. Check out my thread for more info.
am-i-getting-scammed-t587782.html

[seldomseen]

http://www.nissanassist.com/faqs.php?menu=3