The V4 Equal Length Header continues from the worldwide success of the V3, designed using 3D scans of the engine and engine bay in CAD to achieve the most efficient possible layout. Designed and built in-house at Infinity Design's own facility.
Where the V3 was close to equal length, the V4 primaries are now 100% equal length, giving a marginally smoother tone. The larger overall volume benefits stock engines, bolt-on builds and larger-displacement 5.5L–5.8L engines alike. Each primary has a 730 mm centre-radius length and steps from 42 mm up to 45 mm near the collector, feeding an enlarged F1-style slip-on collector built from 45 mm pipework.
CNC-machined flanges taper internally from the oval cylinder-head ports to the 42 mm primary O.D. for a smooth transition, joined with full-penetration argon-purged welds. Fitment and head-stud access have been improved, with all nuts reachable using normal workshop tools when the primary fitting sequence is followed.
Please allow approximately a 6-week lead time, as each header is manufactured to order at the Infinity Design facility.
Performance Testing
The V3 consistently gained 30–40 hp on many cars worldwide on independent dynamometers; no additional power is expected from the V4, which focuses on perfecting equal-length geometry, volume and fitment. An ECU tune is required.
Features
- +30–50 hp with a supporting tune (V3-proven gains)
- 100% T304 stainless steel construction
- 100% equal-length stepped primary design (42 mm → 45 mm)
- 730 mm centre-radius primaries with enlarged F1-style collector
- CNC-machined internally tapered flanges
- Full-penetration argon-purged welds
- ECU tune required
SHIPPING
All items are subject to a handling period before they are dispatched. 99% of orders leave the warehouse within 1-3 days of payment. We will notify you by email when your items have been shipped. Most items should be received within 3-7 business days of your order date. This may be longer for international delivery.
* DELIVERY TIME= Processing Time + Shipping Time
* These shipping times are estimates, not guarantees but we always strive to get your order to you as soon as possible.
Shipping Costs:
● Shipping fees are calculated at checkout based on your location and the chosen shipping method.
Order Tracking:
● Once your order ships, you will receive a confirmation email with a tracking number and a link to monitor your shipment's status.
International Shipping:
● We ship internationally to selected countries. Rates and delivery times vary by destination.
Customs Fees and Import Duties:
● International orders may incur customs duties and taxes, which are the customer's responsibility. Please check with your local customs office for details.
Lost or Damaged Shipments:
● We are not liable for packages that are lost or damaged during shipping. For damaged items, please contact the shipping carrier to file a claim.
Customer Service Contact:
● For any questions regarding shipping, reach out to our customer service team at sales@sbxperformance.com
RETURN/REFUND POLICY
We have a 30-day return policy, which means you have 30 days of purchase your item to request a return.
To be eligible for a return, your item must be in the same condition that you received it, unworn or unused, with tags, and in its original packaging. You’ll also need the receipt or proof of purchase.
-Returns accepted within 30 days of purchase if the item is unused and in original packaging.
-Customer is responsible for return shipping unless the product is defective.
-Refunds processed within 5-7 business days after receiving the returned item.
To start a return, you can contact us at sales@sbxperformance.com.
If your return is accepted, we’ll send you a return shipping label, as well as instructions on how and where to send your package. Items sent back to us without first requesting a return will not be accepted.
You can always contact us for any return question at sales@sbxperformance.com.
Damages and issues
Please inspect your order upon reception and contact us immediately if the item is defective, damaged or if you receive the wrong item, so that we can evaluate the issue and make it right.
Exceptions / non-returnable items
We do not accept returns for hazardous materials, flammable liquids, or gases. Please get in touch if you have questions or concerns about your specific item.
Unfortunately, we cannot accept returns on sale items or gift cards.
Exchanges
The fastest way to ensure you get what you want is to return the item you have, and once the return is accepted, make a separate purchase for the new item.
European Union 14 day cooling off period
Notwithstanding the above, if the merchandise is being shipped into the European Union, you have the right to cancel or return your order within 14 days, for any reason and without a justification. As above, your item must be in the same condition that you received it, unworn or unused, with tags, and in its original packaging. You’ll also need the receipt or proof of purchase.
Refunds
We will notify you once we’ve received and inspected your return, and let you know if the refund was approved or not. If approved, you’ll be automatically refunded on your original payment method within 10 business days. Please remember it can take some time for your bank or credit card company to process and post the refund too.
If more than 15 business days have passed since we’ve approved your return, please contact us at sales@sbxperformance.com.
