MazdaSpeed 3 / 6
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Coil Tuck Harness
$300.00The MazdaSpeed 3 & 6 Coil Harness is a way to clean up the engine bay and replace heat weathered wires and connectors. The Harness is universal between the Gen 1 and Gen 2 Speed 3, as well as the...$300.00Qty in Cart: 0Quantity:Price:$300.00Subtotal: -
Split Second Additional Injector Controller Modification
$180.007/4/2026 Update: We have 8 SSAIC V4H Units in stock available for purchase and modification. For the remaining units we have in stock, if purchasing a unit from us here at Harnessed Performance, they...$180.00Qty in Cart: 0Quantity:Price:$180.00Subtotal: -
Direct Injection Harness
$145.00The MazdaSpeed 3 & 6 Direct Injection harness is a complete replacement for the OEM Fuel Injector Harness to allow for a clean tuck to show off the engine bay. This allows the customer to no longer...$145.00Qty in Cart: 0Quantity:Price:$145.00Subtotal: -
SSAIC / WotBox Adapter Harness
$85.00New Adapter harness that goes between the Coil harness and main engine harness to easily integrate a Split Second Additional Injector Controller or WotBox. No need for a modified or tucked coil...$85.00Qty in Cart: 0Quantity:Price:$85.00Subtotal: -
WotBox Modification
Harnessed Performance
$85.00The WotBox Modification is for taking the un-terminated harness of the N2MB WotBox and terminating the 12V+ connection to our choice of 2 way connector used in our Coil harness, adding grounding...$85.00Qty in Cart: 0Quantity:Price:$85.00Subtotal: -
Mazdaspeed 3/6 Upstream O2 Sensor Extension Harness
Harnessed Performance
$50.00 - $60.00The MazdaSpeed 3/6 Upstream O2 Sensor extension is a 6, 12, or 18 inch extension harness available for those with aftermarket top-mount exhaust manifolds or those looking to tuck wires that allow you...$50.00 - $60.00Qty in Cart: 0Quantity:Price:$50.00 - $60.00Subtotal: -
Mazdaspeed 3/6 Throttlebody Extension Harness
$40.00 - $50.00The MazdaSpeed 3/6 ThrottleBody extension is a 12, 18, 24 inch (or longer upon request) extension harness available those looking to tuck or reroute their OEM Main Engine Harness. This product...$40.00 - $50.00Qty in Cart: 0Quantity:Price:$40.00 - $50.00Subtotal: -
MazdaSpeed 3 ECU Connectors (Coming Soon)
$40.00OEM Replacement for Mazdaspeed 3 ECU Connectors. The listing is for a single connector. Left or Right. Left and Right are both indicated on the white faceplate of the connector by an "L" or "R". This...$40.00Qty in Cart: 0Quantity:Price:$40.00Subtotal: -
Mazdaspeed 3/6 Downstream O2 Sensor Extension Harness
Harnessed Performance
$27.00 - $33.00The MazdaSpeed 3/6 Downstream O2 Sensor extension is a 12, 18, or 24 inch extension harness available for those with aftermarket downpipes/ exhaust systems that allow you to retain downstream O2...$27.00 - $33.00Qty in Cart: 0Quantity:Price:$27.00 - $33.00Subtotal: -
VVT Extension
Harnessed Performance
$30.0018in VVT Extension for the Mazdaspeed 3 or 6. This will allow for tucking the stock wiring to run behind the valve cover for a cleaner look. Installation involves depinning the oem connector and...$30.00 -
Cooling Fan Control Module Connector
Harnessed Performance
$10.99 - $13.99OEM Replacement for Mazdaspeed 3 & 6 Cooling Fan Control Module Connector. Available as Connector Housing and sockets/seals, a pigtail, or housing only.Â$10.99 - $13.99 -
Request Connector (read description)
$11.99This listing is for Special Orders of connectors that we carry in stock or can obtain but do not have a listing for yet. If you are after a certain connector, reach out to us via phone or email on...$11.99