Valvetronic Designs - Porsche Cayenne Turbo S/GT/GTS 400 Cell Catted Downpipes
- Description
- Fitment
- Refund Policy
Porsche Cayenne Turbo S / GT / GTS – EPA-Compliant 400 Cell Catted Downpipes
Precision Engineered for the 4.0L Twin-Turbo V8 • High-Flow Performance •
Introducing Our NEW 400 Cell EPA-Compliant Downpipes for Cayenne
The Porsche Cayenne Turbo platform is a masterclass in performance engineering. However, factory catalyst restrictions limit the full efficiency and character of its 4.0L twin-turbo V8. Our NEW EPA-compliant 400 cell high-flow catted downpipes are engineered to reduce exhaust restriction, improve turbo response, and refine the exhaust note — all while maintaining emissions compliance standards.
Designed specifically for the Cayenne Turbo S, Turbo GT, and GTS, these downpipes elevate the driving experience while preserving the precision Porsche is known for.
Why 400 Cell?
- EPA-Compliant 400 Cell High-Flow Catalysts: Increased exhaust efficiency while maintaining compliance standards.
- Improved Turbo Response: Reduced backpressure sharpens throttle input and mid-range delivery.
- Refined Yet Aggressive Sound: Deeper tone with enhanced clarity at higher RPM.
- Maintained Daily Comfort: Performance gains without sacrificing drivability.
Engineering & Performance
- Optimized Flow Design: Reduces restriction while preserving catalyst efficiency.
- Mandrel-Bent Tubing: Smooth internal transitions for consistent exhaust velocity.
- Precision TIG Welding: Built to endure high temperatures and sustained boost pressure.
- Direct OEM Bolt-On Installation: Utilizes factory mounting locations.
- Engineered to Pair with Valvetronic Exhaust Systems
Sound Profile
- Stock Exhaust + Downpipes: Noticeable increase in depth and presence without overwhelming cabin refinement.
- Valvetronic Exhaust + Downpipes: Sharper response, increased volume, and a more motorsport-inspired character while retaining Porsche composure.
Construction & Durability
- Premium high-grade stainless-steel construction
- High-temperature resistant 400 cell catalyst cores
- OEM-style sensor placement for proper operation
- Engineered for long-term reliability under high performance conditions
Elevate the performance and sound of your Porsche Cayenne — engineered with precision, starting at the source.
📩 Questions or ordering assistance? customerservice@valvetronic.com
Returns
Our policy lasts 14 days. If 14 days have gone by since your purchase, unfortunately we can’t offer you a refund or exchange. All items are subject to 15% restocking fee from the manufacturer.
To be eligible for a return, your item must be unused and in the same condition that you received it. It must also be in the original packaging.
Additional non-returnable items:
Gift cards
Downloadable software products
To complete your return, we require a receipt or proof of purchase.
Please do not send your purchase back to the manufacturer.
There are certain situations where only partial refunds are granted (if applicable)
You will be responsible for paying for your own shipping costs for returning your item. Shipping costs are non-refundable. If you receive a refund, the cost of shipping to you will be deducted from your refund. If your original order qualified for free shipping, the actual cost of shipping the item to you will still be deducted from your refund.
If you would like to start a return please click here
Refunds (if applicable)
Once your return is received and inspected, we will send you an email to notify you that we have received your returned item. We will also notify you of the approval or rejection of your refund.
If you are approved, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within a certain amount of days.
You will be responsible for paying for your own shipping costs for returning your item. Shipping costs are non-refundable. If you receive a refund, the cost of shipping to you will be deducted from your refund. If your original order qualified for free shipping, the actual cost of shipping the item to you will still be deducted from your refund.
Late or missing refunds (if applicable)
If you haven’t received a refund yet, first check your bank account again. Then contact your credit card company, it may take some time before your refund is officially posted. Next contact your bank. There is often some processing time before a refund is posted. If you’ve done all of this and you still have not received your refund yet, please contact us at info@amtuning.ca.
Sale items (if applicable)
Only regular priced items may be refunded, unfortunately sale items cannot be refunded.
Labor Fees (if applicable)
AM Tuning Canada is not responsible for, and shall not be liable for, any labor fees, installation charges, removal charges, diagnostic fees, or other service-related costs incurred by the customer or any third party in connection with the installation, removal, modification, servicing, or use of any products purchased from AM Tuning Canada. Unless expressly agreed to in writing by AM Tuning Canada, all such labor and service costs are the sole responsibility of the customer.
Exchanges (if applicable)
To start an exchange, click here
Non-refundable items
The following items are non-refundable and non-returnable once purchased: oils, fuel or oil additives, filters, tuning cables, OBDeleven products, Braum seats, spark plugs, coil packs, and similar consumable, wheel spacers, wheels bolts, license plate brackets, electronic tuning components and any other product subject to discretion of AM Tuning Canada.
Other products from brands such as MHD, Bootmod3, Ecutek, Braum racing, Novitec are also non-refundable and non-returnable.
All sales of these items are final and are subject to the policies and discretion of AM Tuning. By completing a purchase, the customer acknowledges and agrees to these terms.
