| Increase your horsepower rating with bolt-on performance. The Bursch header system increases your horsepower by decreasing back pressure and smoothing out exhaust flow. Choose between 1-1/2" to 1-3/4" for tuning your exhaust to your engine size. Great for racing upgrades! Sold in pairs. Header measurement size is at outside diameter of tubing. Recommended application for fuel injected cars:
1-3/4" external diameter: 3.0L and larger
1-5/8" external diameter: 2.8L - 2.9L
1-1/2" external diameter: mild 2.7L and under Recommended application for carbureted cars:
1-3/4" external diameter: open exhaust 2.8L and larger race cars
1-5/8" external diameter: open exhaust 2.5L - 2.7L race cars, 3.2L and larger street cars
1-1/2" external diameter: open exhaust 2.0L - 2.4L race cars, 2.0L - 3.0L street cars | 
