Here are some sample Dyno Charts so you can see for yourself the difference Advance Headers can make to the power output of your car.
This flow chart compares large radius press bends to tight radius mandrel bends.
Tight radius mandrel bends are generally considered more aesthetically pleasing, however, flow tests indicate that the large radius press bends (as used by Advance Headers), are in fact a superior product.
The flow test was conducted on a ported Holden 308 head with large valves and 8 different valve lifts. The first test was on a mandrel bent pipe bolted to the head with 3 bends in it, 100° - 30° - 90°. The second test was an identical press bend copy.
4 of the press bends flowed better than the mandrel
2 flowed the same
2 mandrel bends flowed better than the press
Overall, large radius bends increase exhaust flow, improving exhaust efficiency and engine performance. Advance Headers with their large radius press bend headers provides the ultimate in quality and fitment for your car.