Test vehicle:
1987 Ford mustang LX
Engine size: 140 cu in.
No. of cyls: 4
Compression: 10.0:1
Ford Motorsport A-237 cam
Stock exhaust
119 HP4850 RPM 131 FT LB@ 3700
Ranger header 2.25" exhaust, turbo muffler
121 HP@4900 RPM 130 FT LB@ 3850 RPM
Pacesetter header 2.25" exhaust, turbo muffler
126 HP@4950 RPM 137 FT LB@ 3900 RPM
Speedway header 3"-2.5" exhaust, turbo muffler
147 HP@5200 RPM 151 FT LB@ 4050 RPM