# Exhaust Riser Extension 12" - Cast 316 (HDI GMR 12)

12" 316 Stainless Steel Extension Riser

-   Fits Yanmar mixing elbow for the following engine models:
-   1GM / 2GM / 3GM / 1GM10 / 2GM20 / 2GM30 / 2GM20F / 3GM30F / 3GM30 / 3HM / 3HM35F / 2GMF / 3HMF / 3GNF / 3JH5E / 3JH3E / 4JHE / 4JH2E / 4JH2CE / YSM12 / 2YM-15 / 3YM-30 / 2QM15 / 2QM20 / 3QM30
-   Extends exhaust intake port by 11 inches.
-   Overall length of this product is 12 inches
-   Heavy wall 316 Stainless steel
-   1-1/2 BSPT thread LH / RH
-   Fits Elbows:
-   GM / GML / GM2 / JHL / LSB / YSML / QML / GMKIT / 2GMKIT / YMKIT / QMKIT

This is a HDI Marine part HDI GM R12

## Details

- **Price:** 207.5 AUD
- **Vendor:** HDI Marine
- **Tags:** Sawley’s AAM Aftermarket – Exhaust Elbows Mixers & Risers – Yanmar HDI | Marine Exhaust Elbows Risers & Mixing Elbows

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 207.50 AUD | In stock |

## Images

- Exhaust Riser Extension 12" - Cast 316 (HDI GMR 12)

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/exhaust-riser-extension-12-cast-316-hdi-gmr-12)
> Updated: 2026-06-23