Exhaust System Knowledge Base

Horsepower depends on flow, not pipe diameter alone

Bigger isn't always better. Systems that are two large in diameter can actually hurt performance. Improved flow is what you need.

Having large diameter pipes isn't what's cool. Going fast and making horsepower is!

Balance Tubes

Balance Tubes (or 'H' pipes) help to even out the pulses in the exhaust gases and balance the backpressure between both banks of your engine. They not only help improve horsepower, but sound as well.

To find the right location to install your balance tube, apply a strip of paint down the front of the exhaust pipes. The balance tube should be placed where the paint burns off (bubbles) on the exhaust pipes. Generally, put the balance tubes as close to the headers as possible. The balance tube diameter should be at least 75% of the diameter of the pipes with which it connects.

Engine CID
(Liter)

Pipe Diameter (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

400
450
500

450-500
(7.4-8.2)

 

4.50
4.50
4.50

3.50
3.50
3.50

500
600
700+

 


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