Know the landed cost before you order
Prices include VAT. Shipping is charged separately and calculated at checkout for your destination. If no shipping option is shown, contact us for a quote before ordering.
Give your TRX a front exhaust to match your ambitions
Your TRX already has a supercharged V8 worth enjoying. These Kooks kits upgrade its headers and front connections together, with a choice of 1-7/8" or 2" primaries and H.O. GREEN catalytic connections. The rear pipes use the OEM two-bolt flanges, so the factory cat-back can stay.
SKUs: 3521H410, 3521H440, 3521H640
Choose the header and catalyst combination
The 1-7/8" kit is available with Competition Only pipes or H.O. GREEN cats. The 2" kit uses H.O. GREEN cats. The catted versions have 4-1/2" catalyst bodies and a 300-cell substrate, giving you a high-output catalyst specification suited to the supercharged engine.
Matched parts and a familiar rear interface
Mandrel-bent 304 stainless steel tubing, 3/8" header flanges and the supplied gaskets and hardware make this a substantial paired upgrade. The OEM two-bolt rear interface lets you retain the factory cat-back or a compatible replacement that uses the same connection.
Choose your configuration
| SKU | Configuration | Supplied arrangement | Fitting / engine conditions |
|---|---|---|---|
| 3521H410 | Header Size: 1-7/8"; Cat Type: Comp. Only | 1-7/8" headers; Competition Only front connections | Uncatted; competition use |
| 3521H440 | Header Size: 1-7/8"; Cat Type: H.O. GREEN Cats | 1-7/8" headers; H.O. GREEN cats front connections | Use the SKU-specific vehicle rows below |
| 3521H640 | Header Size: 2"; Cat Type: H.O. GREEN Cats | 2" headers; H.O. GREEN cats front connections | Use the SKU-specific vehicle rows below |
Tuning for your exhaust upgrade
We recommend tuning with every header installation so the calibration suits your new headers, complete exhaust and fuel. Contact us to discuss the right tuning route for your vehicle.
Vehicle fitment
| Years | Vehicle / trim | Engine | Applicable SKU | Fitting conditions |
|---|---|---|---|---|
| 2021-2023 | Ram 1500 TRX | 6.2L V8 | 3521H410, 3521H440, 3521H640 |
Intended use
3521H410: Competition, off-road and track use only. Not for use on public roads.
The competition-use waiver applies to 3521H410.
Ordering and delivery
Estimated lead time is 4-6 weeks. Delivery may be faster depending on stock levels. Shipping is charged separately.
Technical specifications
| Specification | Details |
|---|---|
| SKUs | 3521H410, 3521H440, 3521H640 |
| Application | RAM 1500 TRX 6.2L supercharged HEMI |
| Material | 304 stainless steel; mandrel-bent tubing |
| Header choices | 1-7/8" or 2" primaries; 3" collectors |
| Flanges | 3/8" thick |
| H.O. GREEN cats | 4-1/2" bodies; 300-cell substrate |
| Rear connection | OEM two-bolt flanges |
| Included | Headers, selected front pipes, gaskets and installation hardware |
Frequently asked questions
Do the kits include front connection pipes?
Yes. Choose the Competition Only or H.O. GREEN configuration against the SKU.
Which 2-inch kit is on this page?
3521H640 pairs 2" headers with H.O. GREEN catted connections. The 1-7/8" H.O. GREEN kit is 3521H440.
