The stock Svt TB is 66mm. The only reason im using a cfm 67mm is the ratio it opens is different and I perfer metal over plastic any day. Ur not going to see hp from it.
2013 F-150 FX2 SUPERCAB 5.0 BRIGHT RED. HIDS, NAVIGATION
LEATHER, SONY 700WATT SYSTEM, 9.8 1/8 mile for now stock