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Air Box Size Guide

The Air box size guide shows the part length (A) height (B) and Depth (C) of our range of air boxes. When using the guide allow for the depth of the back plate when finding the depth of the air box for example the Hockenheim 422 has a total depth of 239mm on its own and a depth of 259 using standard Base Box.


If there are multiple Air Boxes that would fit in your engine bay please read our Air box selection guide for advice as to which Air Box is best suited for use on your vehicle

Note: Links to products are Carbon Fibre only, GRP versions of each airbox are available

This guide is available for download here!


Filter Type Key 

Filter Type Symbol Link To Product area 
Air Induction Air Induction Filters
Internal Dome  Internal Foam Dome Filters
Panel Panel Filters
Trumpet Sock Trumpet socks
Internal Cone Cone Filters 
Rectangular Air filter Rectangular Filters 

 

Hockenheim Range

The Hockenheim range is a versatile group of products allowing for easy customization with the ability to trim the air box to fit any engine bay and the potential to bond single or multiple inlet pipes to any face on the air box. The 422 and 405 Air boxes can be used with an internal ITG Dome filter bespoke to Reverie designed to optimise air flow through the box. Like all of our air boxes the Hockenheim can be used with an air induction kit allowing for the use of ram air scoops.

Model

Dimensions (mm)

Volume (litres)

Inlet type/size

Filter type


A

B

C

250

250

30520015.3Inlet Pipe
354

354

122

199

8.6

Inlet Pipe

422

422

144

239

14.5

Inlet Pipe

422 XE

422

144

239

14.5

100 / 75mm 

585

585

144

239

20.1

Inlet Pipe

405

405

305

200

24.7

Inlet Pipe

*
605

605

305

200

36.9

Inlet Pipe

*When used with Interlagos ram air filter cowl


Hockenheim back plate size guide


Model 
Back plate dimensions (D)
Base Box
Flat
20mm spacer
40mm spacer
60mm spacer
20
2
40
60
80
20
2
40
60
80
20
2
N/A
N/A
N/A
20
2
40
60
80
20
2
40
60
80
20
2
40
60
80

  

Zolder Range

The Zolder air box range can be fitted to most four cylinder engines, unlike the Hockenheim 422 range, the Zolder range are pre sized and not designed to be trimmed, however they are available in shallow or deep varieties allowing for use in most vehicles even where space under the bonnet is at a premium. Like the Hockenheim the Zolder air box can also be used with an internal ITG dome filter, the version for the Zolder has a gasket integrated into the filter for a good seal.

Model

Dimensions (mm)

Volume (litres)

Inlet type/size

Filter type

 

A

B

C

65 C

660

150

65

4.125

100mm

65 X

565

200

65

4.125

100mm

112 D

490

140

112

5.725

100mm

112 X

143

275

112

5.725

100mm

122 Macau

525 130 210 7.15 100mm

150D

480 148 160 9.15 127.5mm

6 Cyl

655 117 245 10.5 127.5mm

 
 

Zolder back plate size guide

 

Model       
                                   Back plate Dimensions (D)                                 
Flat
Shallow 30mm
Deep 60mm
2
30
60
2
30
60
2
30
60
2
30
60

 

Silverstone Range

The Silverstone air box is one of the most popular air boxes in our range; it has been designed to package a 152mm K&N cotton gauze filter which can be used with a range of adapters to fit various ducting sizes. The back plate can be specified as either alloy or carbon fibre and a range of accessories such as increased depth fuel rail spacers allow for fitment to a difficult engine. Like all of our air boxes, the Silverstone can be used with an air induction kit to add a ram air scoop.

Model
Dimensions (mm)
Volume (litres)
Inlet type/size
Filter type
 
A
B
C
LH 102
590
150
102
8.4
152mm
RH 102
590
150
102
8.4
152mm
LH 78
590
160
78
7.6
152mm
RH 78
590
160
78
7.6
152mm

 

Silverstone back plate size guide


Model      
                        Back plate dimention (D)                           
Alloy Back plate
Carbon Back Plate
20mm Increased Depth
2
2
20
2
2
20
2
2
20
2
2
20


Sebring Range

The Sebring air box range is designed to fit most four cylinder engines and is intended for use with oval inlet pipes. The inlets can be bonded into any of the four faces allowing for easy fitting. Sebring air boxes are intended for use with rectangular air filters; K&M air filters are recommended and can be supplied with the air box (sold separately). 75mm inlet pipes or 75mm/100mm Oval outlet intakes are most suited for use with the Sebring. The Sebring can be used with our air induction filters. 

Model

Dimensions (mm)

Volume (litres)

Inlet type/size

Filter type

 

A

B

C

4-105

500

200

105

10.5

Inlet Pipe

4-78.5

500

200

78.5

7.85

Inlet Pipe

4-67.0

500

200

67

6.7

Inlet Pipe

4-54.5

500

200

54.5

5.45

Inlet Pipe

Sebring back plate size guide

Model
Overall Fitted Depth Options (D)
Base Box
20mm spacer
40mm spacer
60mm spacer
105
125
145
165
78.5
98.5
118.5
138.5
67
87
107
127
54.5
74.5
94.5
114.5

 

Interlagos Range

The Interlagos 4CL air box can be fitted to most four cylinder engines and can be trimmed to ensure a perfect fit, the outlet to the throttles can be mounted on the back plate or on any of the three faces of the box, in this configuration the back plate can be used as an access / inspection panel. Intakes, inlet pipes or trumpets can be bonded to any face of the air box to allow connection to an air induction kit or canister.

Model

Dimensions (mm)

Volume (litres)

Inlet type/size

Filter type

 

A

B

C

425

425

140

128

7.1

Inlet Pipe

425F

425

140

128

6

Inlet Pipe

425X

425

140

303

9.95

100mm

*
425Y

425

140

250

9.45

100mm

*
425Z

425

140

221

9.15

Inlet Pipe

*

*When used with interlagos ram air filter cowl

 

Interlagos 425 back plate size guide

Model
Back plate dimention (D)
Base box
Flat
20mm spacer
40mm spacer
60mm spacer
20
2
40
20
60
20
N/A
40
20
60
20
N/A
40
20
60
20
N/A
40
20
60


Intake Sizing

An inlet that is too small will cause a pressure drop inside the air box restricting performance. This sizing guide shows the minimum recommended inlet and ducting size for a power output category. The larger the power output of an engine the more air it will require to run at peak efficiency, therefore a larger inlet pipe/duct is needed as power increases. Multiple smaller intakes/inlet pipes can be used to achieve the same open inlet area as a larger intake/inlet pipe, for example if a larger inlet won't fit on the air box, multiple smaller inlets or oval outlet pipes could be used to create a comparable open area. High flow alloy straight trumpets can also be used as intakes.


BHP Category

Open Area (cm²)

Inlet Diameter (mm)

1 - 150

44.18

75.0

150 - 205

56.75

85.0

205 - 265

78.54

100.0

265 - 325

127.68

127.5

325 +

181.46

152.0

On typical engines 150CFM is required for each 100BHP

On high performance engines 130CFM is required for each 100 BHP


The formula below shows the formula for required airflow to the engine in cubic feet per minute.

CFM = Engine Capacity (Cubic Inches) / 3464  * Max RPM

1L = 61.0237in³

For example a 5.7 litre engine requires 703CFM of air at 7000rpm :
703 CFM = 347.84CI / 3464 * 7000RPM

Or if supercharged...


CFM = (CI * RPM / 3456) * (boost [psi] / 14.7 + 1)


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