Its due to your emissions. most of the un burnned gas is goin back into your exhause and its burning off, that is the popping you hear. if you remove all your emissions then it wont pop anymore. i had to plug some tubes that came off the back of my heads.
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Grand Valley State University Senior Accounting and Finance Major
1985 Mustang GT 19,000 ORIGINAL miles, E-303 cam, edelbrock performer RPM intake, holley 600 cfm carb, MAC headers, windage tray, 8.8 rear end with 4.10 gears, 4"cowl hood, 5lug conversion, 04 Mach1 wheels.
http://www.mustangworks.com/cgi-bin/moi-display.cgi?1501
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