Once air box is removed, where does the sensor thats on the air box go?

If you are upgrading a standard air box as well as the filter you will need an inlet pipe and the sensor would insert along this pipe.

Does this come with adapter clips?

it comes with 3 option reducers for various intake pipe diameters ( if you need to know what these are i'm pretty sure I saw them online).

Will this fit 2009 Mk2 focus tdci please?

Just measure the diameter of the inlet pipe to which the filter will be fitted, then make sure that's the same or less than the maximum diameter of the filter's fitting.

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K&N Universal Clamp-On Air Filter: High Performance, Premium, Washable, Filter: Flange Diameter: 4 In, Filter Height: 5 In, Flange Length: 1.125 In, Shape: Round Tapered, RG-1001RD

K&N Universal Clamp-On Air Filter: High Performance, Premium, Washable, Filter: Flange Diameter: 4 In, Filter Height: 5 In, Flange Length: 1.125 In, Shape: Round Tapered, RG-1001RD

Product ID: 52664703

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Brand
K&N
Product dimensions
15.2L x 15.2W
OEM part number
RG-1001RD
Global Trade Identification Number
Shape
Round

💨High airflow, low resistance

♻️Washable & reusable

⚙️4 in flange diameter

Description

💨 Elevate your ride with airflow that means business!

PRECISION FIT - Universal clamp-on design fits a wide range of engines seamlessly.
ECO SMART DESIGN - Washable and reusable filter reduces waste and saves energy.
POWER BOOST READY - Unlock enhanced engine acceleration with optimized airflow.
LONG HAUL PERFORMANCE - Maintenance interval up to 80,000 km keeps you on the road longer.
LIGHTWEIGHT DURABILITY - Compact 300g build ensures easy installation without added bulk.

The K&N Universal Clamp-On Air Filter RG-1001RD features a 4-inch flange diameter and a tapered round shape designed for superior airflow and low resistance. Its washable, reusable construction supports up to 80,000 km between maintenance, delivering long-lasting performance and eco-friendly efficiency in a lightweight 300g package.

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Manufacturer	K&N
Brand	K&N
Model	RG-1001RD
Product Dimensions	8.89 x 10.16 x 7.62 cm; 300 g
Item model number	RG-1001RD
Manufacturer part number	RG-1001RD
OEM Part Number	RG-1001RD
Safety rating	Não aplicável
Item Weight	300 g

K&N Universal Clamp-On Air Filter: High Performance, Premium, Washable, Filter: Flange Diameter: 4 In, Filter Height: 5 In, Flange Length: 1.125 In, Shape: Round Tapered, RG-1001RD

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Description

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