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CC Insert Performance with Ford 557

Engine Brand: Ford
Engine Displacement: 557
Compression:

13:1
Header Size:

2 3/8" 
Collector Size:

4½" 
Insert Type/Size: 2 Disk Insert Part# 2DI45L
Performance Before Using Inserts: 

9.90 car with throttle stop 
Performance After Inserts:

Same E.T. Top speed down 3 mph. Same or slightly quicker 60 ft times
Tuning Changes and Performance Results: 2 jet sizes smaller. No change in throttle stop.
Car Type

Tube Chassis, Ford Mustang 
Type of Racing Done/Class:

Drag Racing 

Further Comments:

Met sound requirements at 94 DBA. Noticeably quieter inside and out. Throttle response was crisper. Car is very consistent. Driver is points champion at local track in Corpus Christi, Texas.