Flexible EGR Tube Reroute

The EGR tube carries hot exhaust to the intake when the EGR valve is open. EGR reduces NOx emissions and engine temperature under specific conditions (low load). Some coolant reroutes are not compatible with the OEM EGR tube, and this was a workaround for that case. Eventually, the Miata got a standalone Megasquirt ECU and the EGR system was removed.

This project replaces the stock EGR tube with a flexible stainless steel line (for gas home appliances).

Stock EGR tube
Replacement gas line and fittings
Ends removed from stock EGR tube
Brass fittings were too wide to fit behind manifold, yellow plastic removed from gas line
Correct length replacement EGR tube
EGR connection to intake manifold
EGR connection to exhaust manifold

Carefully route the EGR so that it does not touch any plastic or rubber parts. Use high-temp thread lock on the exhaust side or the connection will rattle loose.

1/2 inch flexible gas line – 24 inches long$20
1/2 inch OD compression to 1/2 inch FIP brass fittings$15
1/2 inch FIP to 1/2 inch NPT union adapter$5
Exhaust sealant$6

2 Comments on “Flexible EGR Tube Reroute”

    1. 1/2″ plumbing compression fittings from the hardware store, and a 1/2″ NPT to 1/2″ flare union adapter. Also, some high temp exhaust sealant to fill any gaps.

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