Wastegate Accessories

They are the parts that connect a wastegate to the exhaust, route bypassed exhaust gas, deliver boost reference signals, and keep the wastegate sealed and serviceable. For custom builders, they include the weld-on flanges and dump tubes needed to add an external wastegate. For owners, they include the gaskets, clamps, and rebuild parts that keep an existing wastegate holding target boost.

• Match your wastegate model and valve size. Flanges, clamps, gaskets, and rebuild kits are sized to a specific wastegate brand, series, and valve size. Parts for one brand often won't fit another.
• Choose the right flange material. Stainless steel flanges are common for stainless manifolds and downpipes. Mild steel flanges are common for mild steel fabrication. Match the material to what you are welding to.
• Use the correct clamp. V-band clamps must match the flange profile and diameter. A mismatched or reused clamp can leak or loosen under heat cycling.
• Pick a dump tube style. A recirculated dump tube routes bypassed exhaust back into the downpipe, keeping noise down. An open dump tube or screamer pipe is louder and is for off-road and competition use only.
• Plan reference lines and fittings. Use heat-resistant hose and secure fittings for top and bottom port reference lines. Leaks here can cause boost spikes or oscillation.
• Consider water cooling. On high heat or endurance builds, water-cooling fittings and coolant lines can help protect the diaphragm on wastegates that support them.

Should I rebuild or replace my wastegate?

If the wastegate body and valve seat are in good shape, a rebuild kit with a new diaphragm and seals typically restores boost control for less than a new wastegate. Replace the wastegate if the valve seat is damaged, the body is cracked, or the valve size no longer suits your turbo and power level.

Common accessory-related boost problems

Many boost issues trace back to accessories rather than the wastegate itself. An exhaust leak at a gasket or flange can reduce drive pressure and change how the wastegate responds. A cracked reference line can cause boost spikes or let the valve open early. A worn diaphragm can cause underboost. Check these before replacing the wastegate.