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Average Customer Review: 4.5 of 5 Stars! [After 13 Reviews]

Stainless Steel Exhaust Manifold, 4-1, MX5 Mk3/3.5/3.75
Stainless Steel Exhaust Manifold, 4-1, MX5 Mk3/3.5/3.75
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by Matt Bowden
Date Added: Saturday 11 April, 2015
4 of 5 Stars!
A beautiful piece of stainless steel engineering. IL Motorsports don't state which of the bungs to use for the O2 sensor, and - when asked - simply suggested using whichever fitted best. We used the one furthest from the engine as that provided the best cable run for the sensor, and it should be measuring where the gases are better mixed. The stud holes in the flange aren't recessed, like the original, so once done up the ends of the studs are flush with the top of the nuts, which isn't optimal for strength. The head gasket doesn't have the cut out for the EGR system, so there's a risk that the gasket might be blocking the flow slightly. I bought an OEM gasket instead. The wires for the front O2 sensor have to be extended - I don't understand why the manifold only includes an extension for the rear sensor. A front extension can be purchased from I fitted the manifold with the IL Motorsports midpipe and the original backbox, and the increase in power and torque (after a dyno retune at Skuzzle Motorsports) is significant. The exhaust noise is very slightly louder and raspier, but nothing like as loud as I feared - it's fine roof-down or roof-up on main roads. Note that the weld-in bung provided with this kit isn't stainless steel, so it's not a perfect match if you're welding it into an IL Motorsports stainless midpipe. The alternator and the coolant line that runs above the manifold might need some additional heat protection since they're right next to the pipework.

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