Cone filter?

[JTaylor2005]

Thinking of designing and building a cold air intake for my 306 hdi. Just wondering whether these cars suffer maf issues when they have a cone air filter fitted? And if there are any certain ones that I could get that wont ruin the MAF?

Its mostly just for the deeper noise tbf that I want it but if I do it then I will do a proper cold air feed some how as well

[powerandtorque]

Oiled filters (eg K&N) can cause issues with the MAF as far as I know, although I've no direct experience.

The standard filter setup is a cold air intake though, so I don't personally see the point replacing it unless you need to because you want to go Stage 2 and can't route the pipework with the airbox in place. If anything, a typical air filter cone on the end of the MAF will just suck in warm air.

[JTaylor2005]

Yeah I just like the rumbly noise and the turbo noise. Would try and make a cold air intake if possible as well

[Eeyore]

There is a thread about hdi air filters. Loads of tests done on a rolling road and either the stock filter was better or made no real difference.

[JTaylor2005]

Like the deeper noise and the turbo noise lol

[Eeyore]

get a decat for turbo noise and better performance?

[JTaylor2005]

Getting one. Fair point lol okie dokie standard box it will be haha

[Poodle]

S2000 oem filter with the standard cold air feed would do the trick. Alternatively you could smooth the inside of your standard airbox, that would help amplify the noise.

[shervo]

The only un-oiled cone filter I know to is the ram air kit. £46 on ebay iirc, I have one due to intercooler pipes but tbh I plan on going back to an airbox or make a heatshield for this one.

[Toms306]

Pipercross also make non-oiled filters, but RamAir are cheaper (and slightly worse quality).