[WC] "Here's a tip for the speed density guys. Since there is no mass air meter, there's nothing to mount the air filter to! I mounted mine directly to the throttle body, but once the body was on, there was some interference. I ended up re-using the old plastic air intake that used to connect to the airbox. If you cut it right after the bend, just before the corrugated part starts, it's about the right diameter to fit inside the air filter. Works pretty slick and looks good too."

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Question: [gy] "Shouldn't the diameters of all of the intake components (hoses, MAF, throttle body, spacer, and upper manifold) be close to the same? Upgrading one or two parts isn't going to improve airflow unless everything is bigger.
I see discussions about using 73mm or 77mm MAFs, but I don't see what the benefit is. Maybe I'm missing something."

Answers: 

[WP] "The MAF has some pieces in the flow path and that is the reason for having larger MAF's than TB's."

[FK] "The MAF needs to be bigger than the TB. If you're using a 65 or 70 mm TB, you should have a 73 or 75 mm MAF. A bigger TB doesn't do any good if you can't get the air thru the MAF first."

[ep] "I'm using an explorer intake / 65mmTB. I was planning on using a 80mm mass air meter from a late model Lincoln MK8. Can the mass air meter be to big?"

[WP] "Nope, I'm running the 80mm on my car"

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