[OllyH]

Hi everyone - was wondering if someone could explain the difference between these for me. Also, would fitting an air fliter to my Cooper change my insurance premiums? Is there any performance advantage or purely a change in sound?
Cheers

[mike4]

air filter is just the filter, induction kit is the housing


enclosed induction kit replace the entire housing, all about performance, sound increase aswell, most expensive and effective upgrade. pipercross viper or the ITG are the best
open induction kit,replacing the airbox housing purely sound advantage, if anything they can decrease performance
air filter slight difference in increase-safest and cheapest

declare everthing to the insurace, a filter replacement wont make a difference at all and i wouldnt declare a filter replacement if i were doing it. £50 increase max for a whole new induction kit

[Root Ginger]

OK, I'll try and clarify what mike4 is saying.

An air filter is either the standard filter inside your air box, an uprated filter inside your airbox or the specific filtering part of an induction kit, most commonly a cone shaped filter.
Generally here though the air filter will refer to a filter inside the standard airbox.

An induction kit is a complete reworking of the induction system often binning the standard airbox completely for a more open design to allow more airflow.

Crucially the idea of this is to get more cold air into the engine. You see these referred to as CAI (cold air induction) systems as well.

Here's a picture courtesy of S33BBY's gallery of the standard air filter on a Cooper. You'd see this if you took the lid off the box.


click to enlarge

Here's an uprated filter on a Cooper:


click to enlarge

Here's a pic of the GTT Induction Kit courtesy of tnoy66's gallery on an MCS


click to enlarge

Here's a pic courtesy of mini_kitten of the JCW uprated air box on an MCS. This is not strictly an induction kit but good to show the position of the standard airbox in the S.


click to enlarge

[Richard Crofts]

Doh....RootGinger, I was gonna do all that! Would ahve made me look as clever as you do now !

R

[Root Ginger]

Damn if I'd know you were gonna do it i wouldn't of bothered. Now that would of been clever

[OllyH]

Thanks for all your help, just what I wanted to know and much appreciated! Will definetley be looking into this!
Olly