Race Headers are for Non USA or racing vehicles in the US.All Dundon headers are made with 321SS, the advantages of this are numerous and include, better fitment, higher heat tolerance, superior resistance to exhaust gas corrosion and a lifetime structural
Race Headers are for Non USA or racing vehicles in the US.
All Dundon headers are made with 321SS, the advantages of this are numerous and include, better fitment, higher heat tolerance, superior resistance to exhaust gas corrosion and a lifetime structural warranty to the original purchaser.
The headers attach to the factory PSE muffler and are quiet with no drone at cruise, but put your foot down and they’re all kinds of flat six glory.
Dundon Headers are specifically designed for each vehicle and engine. Unlike our competition that uses a one size fits all, we tailor each system to the unique needs of each engine.
Dyno showing Stock GT4 vs Dundon GT4/Spyder Race Headers.
Gains Over Stock.
3600 RPM: +42 wtq
5000 RPM: +36 wtq, +34whp
5800 RPM: +15 wtq, +16whp
6500 RPM: +28whp
7000 RPM: +30whp
7500 RPM: +41whp
Our dyno read the stock car at 330.8 whp at 7400, Porsche rates the car at 385bhp at 7400, this is 14.1% loss with our Dynapack 4000 hub dyno running the car in Rolling Road mode using the factory PIWIS tools.
Dundon Race Header equipped GT4 is now at: 426BHP
At Our Store, we aim to deliver your orders as quickly and efficiently as possible. Below you will find everything you need to know about our shipping and delivery process.
Shipping Methods & Rates
We offer a variety of shipping options to meet your needs. The cost of shipping depends on the shipping method you choose, the destination, and the size of your order. Please refer to the shipping options available at checkout for more details.
Express Shipping: Delivery within 3-5 business days (next-day delivery for some locations).
International Shipping: Available to selected countries. Delivery time and shipping fees will vary based on destination.
Processing Time
Orders are typically processed within 1-2 business days from the time your order is placed. Please note that during peak seasons or promotional periods, processing time may be slightly longer.
Tracking Your Order
Once your order has been dispatched, you will receive an email with tracking information so you can monitor the status of your shipment. You can also check the status of your order in your account under “Order History.”
Delivery Times
Estimated delivery times vary depending on your location and the shipping method selected. For international orders, customs processing may cause delays, which are beyond our control.
Domestic Orders: Typically arrive within 3 business days.
International Orders: Delivery times may range from 7 business days, depending on the destination country and customs clearance times.
Lost or Damaged Packages
While we take great care to ensure your items are packaged securely, accidents can happen. If your order arrives damaged or you believe it’s lost, please contact us at customer service email or phone number within 7 days of receiving your package. We will investigate the issue and provide a solution.
Contact Us
If you have any questions or concerns about shipping and delivery, don’t hesitate to contact our customer support team at customer service email or phone number. We’re here to help!
Thank you for shopping! We appreciate your business and strive to provide you with an exceptional shopping experience.
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