For extra room during installation, first remove the factory engine bay shrouds (outlined in red, Figure 1.0). This is done with a 4mm Allen key.

Remove the flexible intake hose (outlined in yellow, Figure 1.0) by loosening the two clips on either side using an 8mm socket. You may also wish to disconnect the oil breather hose, which sits on a retainer clip.

While the intake hose is off, it's a good moment to give the throttle body a quick wipe to clean.

Unclip the MAF sensor — push in to unlock, then pull to remove. Unbolt/unscrew the MAF sensor, carefully pull it out, and set it somewhere safe until reassembly.

Remove the top half of the airbox by unclipping the three silver latches. The top and right-hand latches usually release easily by hand. The left-hand latch can be tricky — it's part-hidden under the clam. If you can't reach it, don't worry; we'll release it in a later step.

On level ground with the handbrake on, follow the Lotus handbook instructions for jacking the car. You'll need to access and remove the rear left wheel (airbox side).

With the car safely raised, remove the rear left wheel. Then remove the wheel arch trim using a trim removal tool and Phillips screwdriver — there should be 6× trim screws plus one pull-out wheel arch stud.

With the trim removed (Figure 3.0) you'll see the side intake funnel (green line). Pop the corrugated ducting off by pushing it upwards after loosening or removing the zip ties.

Above the suspension turret (Figure 4.0) you'll now see the "hidden" latch mentioned in Step 03 — it's now visible and accessible. Unlatch and release it, then go back into the engine bay and lift out the top half of the OEM airbox.

With the top half removed, you'll have two vacuum pipes loose: one from the charger (red dots) and one connecting to the Y-piece (yellow dot) — see Figure 5.0.

• Disconnect the red-dot pipe from the charger and remove it completely.
• Disconnect the red vacuum pipe (this runs to the exhaust flap solenoid) from the Y-piece, then connect it to the charger — into the port you just freed up (Figure 6.0).
• At this point you can also remove the black vacuum lines and the Y-piece originally connected to the airbox.

Use a 10mm socket to remove the three bolts holding the bottom half of the OEM airbox in place (Figure 7.0). The bottom half should now be loose.

You may be able to lift the OEM airbox out completely at this stage. If it feels caught, check underneath — one of the ducts may be wrapped around the wiring loom (highlighted in red, Figure 8.0).

If so, loosen the jubilee clip highlighted in yellow and pull the ducting off. You can then push the ducting under the red-highlighted wiring loom, freeing the airbox for removal.

First, wipe all the intake piping down — inside and out — with a clean cloth to remove any dust collected during packing and postage.

Connect the intake pipe to the air filter element using the supplied jubilee clip. Ensure a nice, air-tight seal: any crimping or uneven seal will cause "fluttering" noises as air gets trapped and expels. Make sure the seal is even all the way round — crimping can result from both over- and under-tightening.

Bolt the MAF sensor to the intake pipe using the supplied M4 8mm bolts & washers. Push the MAF evenly into the flange for a tight seal. To help the O-ring seat properly, tighten gradually and evenly between each bolt. Make sure the MAF is seated and sealed correctly.

With the OEM airbox removed you should have plenty of room. Install the new intake pipe into the OEM factory flex hose that connects to the throttle body — but don't tighten the clamps yet, just connect it up (Figure 10).

Use the supplied P-clip mounted to the back stay tube to support the intake pipe (Figure 11).

Ensure the air filter sits above the side air scoop and isn't fouling any other parts or the clam. You can check this by looking through the wheel arch to help with positioning (Figure 12).

Once you're happy with positioning, go back and tighten the factory flex-hose clamp and the P-clip so everything is secure. Re-connect the MAF wiring with no tension, and check there are no kinks in the crankcase breather hose.

Unbolt the solenoid that operates the flap in the stock airbox — it's simply bolted to the OEM airbox.

Solenoid fixing: the hole on the solenoid bracket needs drilling out to enlarge it for an M6 bolt. Once enlarged, use the M6 button-head bolt (shown in the picture) to bolt the solenoid to the bracket, holding the P-clip for the black charcoal hose. Ensure the solenoid doesn't catch any piping as you angle and tighten it into place (Figure 15).

The intake is installed. Now refit the engine shrouds if you wish — we left ours off to aid cooling and lose a little weight.

• Ensure everything is tight, with no kinks or tension.
• Tidy up any loose wiring and piping with cable ties.
• Reinstall the left-hand wheel arch trim (a few spare arch screws are included).
• Refit the wheel and torque to factory settings.