The Magnefine thing is for the I4 and not the V6. The V6 has a filter that's a little tougher to get to.
The link that namegoeshere
provides is excellent. I also find this post from 2007 to be helpful:
03 V6 2Door Auto Transmission Filter change
I have a 2004 V6 at 99K miles, and my transmission has been shifting harder for at least the last 9K miles so I did the (first) ATF and filter swap this morning. After three drain/refills, it was better. After four drain/refills and the filter change, it's beautifully smooth again.
I tried buying my parts (see the right-hand side of namegoeshere's
link) from a couple of local dealerships, but they wanted something like $66 for them (not including the fluids!). I ordered my parts online from hondapartsnow.com because they're actually local to me, and the parts showed up quickly. Even though they charged $11 for shipping, my total price was still half of what the dealerships wanted.
I went with the Redline D4 ATF and got 12 quarts shipped to me for $110 (look for a reseller on Amazon). This is cheaper than what my local dealers want for for Honda Z1 ATF.
I did four drains and flush and drove a few miles in between. On the last drain and flush, I installed the new filter. Cracking open the ATF housing requires removing the air cleaner box. I also took out the battery and tray, but I'm not sure you need to do that.
People talk about the 3rd bolt on the ATF filter housing, the one on the bottom being difficult to access. I found that removing the other two bolts and the banjo bolt gives you more room. After that, it was just a matter of working at it 1/6 a turn at a time with a spanner until it came out.
You're going to need a 17mm spanner to get that banjo bolt out. I also used 17mm, 10mm and 8mm sockets, socket extensions and a 10mm spanner for that pesky third bolt. The drain plug needs a 3/8-inch socket to remove it. I used my torque wrench because it's got a long handle. A lot of people complain about how tight that drain plug is; it was no problem for me with an 18-inch long wrench.
The "2 Banjo fitting compression washers" referred to on namegoeshere's
link are simply the 12mm crush washers that you use for the oil drain plug. My 2004 EXL V6 (that I bought new) had only one crush washer on it, but the blown up picture from Honda shows 2 crush washers. I reassembled it according to the picture because I have plenty of those 12mm crush washers around.