the popping you are hearing might be an exhaust pop caused by emissions putting gasses and un burned fuel into the exhaust and they are burning in the exhaust.
take off all of the emissions and this wont happen.
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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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