K&N series 63 vs. 77 air intakes

What is the difference between the K&N 77 Series MEtal Intake Kit and the K&N 63 Series AirCharger High-Flow Intake Kit? I read the descriptions, but still don't really understand what the differences are.

I am looking for a bump in power on my 2010 Taco, which one would give me the most.

Thanks.

 

IMO, the only difference is that the "aluminum" has better 'under the hood' looks and possibly, because it is machined, it MAY BE smoother than the Series 63. But, that difference is immeasurable .

Also, I believe K & N even mentions on their site, something about achieving that 'look.'

P.S = If you do purchase the intake, check out the vendor "Car Parts" on eBay beforehand. I got a great deal on my 63 Series for my '10 Taco

 

The 77 has an aluminum tube, the 63 has a plastic tube. 77 refers I believe to the mm diameter of the intake tube as well as the 63. The plastic tube will insulate the charge air better than the polished aluminum tube as it sits directly above the exhaust manifold and cat on the right side of the motor. Colder charge air = denser air which means more O2 for your displacement. But the best part is the way an un-baffled intake sounds! Especially over 3k!

 

Yeah i'm not sure why the 77 is $50 more. Wouldn't the plastic stay cooler?