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BBB On-Line Reliability Seal

Why Aluminum is better than Steel....

Engine
CID
(Liter)
Pipe Dameter (inches)
Horsepower
Single
Dual
150-200
(2.5-3.3)
2.00
2.25
2.50
2.00
2.00
2.00
100
150
200
200-250
(3.3-4.1)
2.25
2.50
2.50
2.00
2.00
2.25
150
200
250
250-300
(4.1-4.9)
2.50
2.50
3.00
2.00
2.25
2.50
200
250
300
300-350
(4.9-5.7)
3.00
3.00
3.50
2.25
2.50
2.50
250
300
350
350-400
(5.7-6.6)
3.30
3.50
3.50
2.50
2.50
2.50
300
350
400
400-450
(6.6-7.4)
3.50
4.00
4.00
2.50
3.00
3.00

350
400
450

450-500
(7.4-8.2)
4.50
4.50
4.50
3.50
3.50
3.50
400
450
500

NOTE: This information is provided as a guideline to pipe size selection for peak performance at full throttle levels. For vehicles that are street driven on a daily basis, consider using the next smaller pipe diameter for best results. Smaller diameter pipes will produce low-to mid-RPM torque. Larger diameters produce mid-to high RPM torque.

BIGGER IS NOT ALWAYS BETTER!!!