i put my stock intake on during winter time because everyone of my cars with a cold air intake ran like crap when ever it would dip past -20F or -50F and colder with them on, which seems like the average temp during the winter months up here

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im afraid not


some peoples supercold is others t shirt weather

Ok, simple answer, yes it does help!
All you have to do is dyno your car on a hot day and then come back later in the winter and dyno it again and you will see a large difference, large enough to matter anyway. Now don't expect something like 30whp difference but their will be a noticeable difference that you will see.

Definitely, and if you drive a turbo car you'll really notice a difference. However, there is only so cold you want to go because at about 45-50 degrees your normal tires will start losing grip. From the seat of the pants, I feel my car is fastest when its 50-60 outside.

The GS400 I used to have was DEFINITELY quicker when the temps got low in Atlanta winter time (maybe 40-50 during day).

Doesn't NOS make a huge difference because of it's cold temp???? I know for sure my car runs better with colder weather.

nitrous makes a big difference because it contains more oxygen than regular air. an ADDED benefit is that it helps bring down air charge temps. since in tis liquid form NO2 is nice and frosty.

lots of big turbo guys who drag 2JZs and the like use nitrous just to cool donwn the air from their massive turbos.

I don't run hard in summer..( vegas summer can go up to 120F)
and winter time my cars run like a champ!! ( 35F)

we don't need disccusion on this, colder air creates more power, this is a known fact! But not cold is alwasy better, engine needs to reach a certain temp to operate properly.

As to the hot is better for traction, not really, try to get grip on a 120F day, and where the ground temp is over 200F where you can boil an egg....

Well, granted, Henry, I don't live there, but from what I do see and hear of it, 30's at low elevations in SoCal are pretty rare, although of course in the mountains you do get snow in the winter.

In fact, I understand that the CHP and local police sometimes close the mountain roads there when it DOES snow at high elevations because many people in the area don't have winter-equipped cars or AWD, right?

I hope you don't mind me being blunt, but in that environment and with those temperatures, DEFINITELY use synthetic oil......especially with a turbo. ( My guess is you probably already do ). Most places in the country you can get away with regular petroleum ( dino ) oil, but the Desert Southwest in summer and the Upper Midwest/Plains in winter are two notable exceptions.

Some guys just don't know, and he's just asking, tahts all.

To answer the original question -
Basically if you have a turbo, you make more power since the air is denser and you can then run more boost at the same level of knock. You also need to maintain the traction to actually put that power to the ground.
In July 2004, I pulled 412 hp on the dyno and in January 2005 I pulled 432 hp on the same dyno, all conditions remaining the same.
The data is from a Mustang AWD dyno.
Supporting data - The car I'm talking about is my 1994 Talon AWD turbo - Shep racing tranny, 650 cc injectors, 4 cyl 2.0 turbo shortblock from a 1992 Eclipse with Eagle rods and Mahle pistons, ARP headstuds, 93 head with HKS cams, Greddy boost controller at 25 psi, AFC2 and chipped and socketed ECU, 57 trim turbo, 3" SS exhaust, 3" FMIC, methanol injection (in place of nitrous).