Which Air Filter?

[Peter (Monty)]

What cone filter would people recommend for an S2000 with stock manifold? Is there space for a twin cone, and is it worthwhile?

To be honest there's too much choice 

[Andy (Sycho)]

I fitted a pipercross cone one, I think it was for a Vauxhall Astra VXR. It's in the garage still in the box if you need the number,  I got it cheap of eBay but anyone will do as long as its the correct size outlet.

[Thrustyjust]

I got a Ramair one from Ramair. it has a built in trumpet to flow air better and also a 72mm ( if I remember correct) alloy elbow, which I wrinkle painted and a couple of silicon joiners. 

[Peter (Monty)]

72mm? I thought my throttle body was 63mm, although I'm currently in Spain so can't check  I like to get stuff ordered when I'm away to save time once I'm back

[Andy (Sycho)]

76mm sticks in my mind, it's definitely not 63mm

[Andy (Sycho)]

Mine was carbon & looks to be bigger than Justin's but the silicon joint takes up any slight differences.

[Dave Eastwood (Gadgetman) - Club Chairman]

Yep, all the ones I've seen  in use, factory builds included have been large bore filters, with a reducer down to the TB size.

[Peter (Monty)]

2 minutes ago, Sycho said:

Mine was carbon & looks to be bigger than Justin's but the silicon joint takes up any slight differences

It's not a competition 

[Andy (Sycho)]

2 minutes ago, Monty said:

It's not a competition 

I know you can't compete with carbon

[Dave Eastwood (Gadgetman) - Club Chairman]

From a dimly remembered conversation with Mark at WSC Ltd, (I don't think it was Simon), the first cars had those nice carbon intake pipes; they were actually an aftermarket kit, filter included I guess for a Honda Civic Type R of some description. I guess they just bought a small job lot, used them on the first cars through, and after that, the dimensions of the pipework from that kit probably just "stuck".

[CraigHew]

The diameter is 76mm as @Sychosaid.  K&N filter for me but I've re-routed it above a "splitter plate" which is intended to provide some colder air above the radiator.

 

see

 

 

 

 

[Thrustyjust]

Factory kit is a larger tube than the inlet body. I kept it the same bore size from tb to filter to keep air less turbulent and didnt see any gain in a large bore then hitting the step down joiner at the TB.