Ramjet Triple Stepped Headers & Cats VE-VF
★★★★★Long-tube power.
Zero clearance compromise.
GM Motorsport reworked what a performance header can be. The REX design delivers true long-tube, equal-length performance in a compact footprint that keeps factory ground clearance — the gains of a long-tube header, without the custom fabrication or clearance headaches that usually come with them.
1¾″ → 1⅞″ → 2″, equal length
Each primary steps up through three diameters — 1¾″ to 1⅞″ to 2″ — keeping exhaust airspeed high where it matters. The result is stronger torque and instant throttle response, without giving up top-end flow.
The near-perfect equal-length “spaghetti” routing scavenges each cylinder evenly, and race-merge collectors tie the primaries together cleanly for a smooth handover into the cats.
Free-flowing, road-legal
Both banks feed straight into high-flow catalytic converters — 100-cell metal or 400-cell ceramic — that clean up the exhaust without strangling it. You keep the cats, you keep it legal, and you still get the flow.
CNC-cut, CAD-modelled flange plates land the port match exactly, and everything bolts to any factory-outlet cat-back. No custom fabrication required.
REX Headers — the full rundown
Engineered to out-flow the field
Triple-stepped primaries
1¾″ → 1⅞″ → 2″ steps keep exhaust airspeed high for stronger torque and instant throttle response.
Fits the factory space
True long-tube primary length while retaining factory ground clearance — no clearance headaches and no custom cat-back.
Bolts to any cat-back
Works with every factory-outlet cat-back — including XForce twin 2.5″ and 3.0″. No custom fabrication.
How the REX headers stack up.
| Feature | Di Filippo | X Force | Pacemaker | HM | Ramjet |
|---|---|---|---|---|---|
| Equal-length design | × | × | × | × | ✓ |
| 304 stainless steel | × | ✓ | × | × | ✓ |
| Triple-stepped primary pipe | × | × | × | × | ✓ |
| Factory ground clearance | × | ✓ | × | ✓ | ✓ |
| Polished finish | × | ✓ | × | × | ✓ |
| Fits factory & off-the-shelf cat-backs | × | ✓ | × | ✓ | ✓ |
| Race-merge collector | Some | Some | Some | × | ✓ |
Fitted. Driven. Reviewed.
Verified feedback from Holden VE-VF owners running the Ramjet REX headers.
Race-proven.
Not marketing-proven.
The REX Triple-Stepped Headers are designed and dyno-developed by the GM Motorsport team — Australia’s largest LSX performance workshop — and built by the same people who race what they engineer. Australian-designed, protected under Design Registration 201615547.
Questions, answered
Will these fit my VE or VF?
Yes — they fit every VE & VF V8 Commodore, including supercharged HSV variants running factory oil coolers. Choose your cat size and material in the configurator above.
Do I need a custom cat-back?
No. The REX headers bolt straight onto any factory-location cat-back, including XForce twin 2.5″ and 3.0″ systems. Any cat-back that begins from the factory outlet will bolt directly on — no modifications needed.
Will I lose ground clearance?
No. The triple-step design achieves true long-tube primary length while retaining factory ground clearance, so there are no clearance issues on a standard VE or VF.
Do I need O2 sensor extensions?
Most vehicles will require an O2 extension. Pick the one that matches your car:
- VE Series 1 & 2 and VF Series 1 — O2 Sensor Extension Harness (square plug)
- VF Series 2 — O2 Sensor Extension Harness (triangle plug)
VF Series 2 staying on the factory cat-back: you will need to weld an O2 bung to the factory cat-back, and you will require 1 O2 extension.
Not sure which one you need? Call +61 452 071 148 and we’ll sort it out.
Metal or ceramic cats?
The 100-cell metal core suits most builds; the 400-cell ceramic core is also available. Both are high-flow — pick your preference in the configurator.
Are these in stock?
Back in stock and ready to ship. The 3″ / Metal cat option is currently on pre-order — order now to reserve yours from the next batch, or call us for the latest dispatch ETA.
Shipping & returns
Shipping is calculated at checkout and ships Australia-wide & worldwide. Unopened items can be returned within 7 days. Not sure it fits? Call +61 452 071 148 or (03) 9746 6656 — talk to the team who builds these.