Hello again, this time I need another hood and I want to install the ram air hood on my 2001 grand am, where can I find it for a good price? New or used for $250 or less 

Firstly, no, the ram air hoods on the GAGTs don't actually duct air into the intake.  I opened the vents on mine about 7 years ago and the only difference is a dirtier engine bay.  As for where to buy one...you can search local junk yards but they are hard to find now.  Buying one will likely cost much more than $250 since it's too big for most 'cheap' shipping methods.  Best bet is to find a used one to purchase.  Keep checking Craigslist or one of the Grand Am specific forums although I haven't seen much available on them for a while...

you're very helpfull, thnx dude!

Another question: how can I change the transmission oil?  it's difficult or not because I was searching for videos on youtube but the only result was the 2.2L ecotec (2002) and mine is 2.4L twin cam (2001) if you could hep me with a link i will be very grateful for your help.

Which transmission do you have? May have better luck looking for that rather than the model. 

Not sure on the 4 cylinder.  I've got the V6 and the only way to drain it is to drop the pan on the bottom.  There's also no dipstick on the V6 (and I'm guessing the 4) so you'll have to empty it and then put in the recommended amount or you'll never know how much is actually in there.