Hi there,

i have just put a k&n filter into my mp350 focus rs.
But when i fitted it i was tempted to leave the lid off ??
Would the car need mapping or would it be better to leave the lid off and
just keep the base ??

please help me out !!

thanks

 

why would you want to leave the lid off? It will allow heat from the engine to be sucked in.

And the whistle fro the turbo will annoy you after a while.

 

That's why I'm asking if its a good idea or not ?
After your comment its obviously a bad thing
To do ?
On all my previous Cars I've always had the air
Box removed!

Thanks

 

After I spoke to mountune last week about eml coming on(dealer said it was the mountune kit causing it)
First thing they said was did I have a k&n filter fitted as they have seen them cause the fault code in the past
I will be keeping the ford filter in mine(for now anyway)

but to answer your question yeah put the lid back on !

 

I didn't take it off luckily I thought I would ask on
Here first !!

Thanks a lot for your reply !

 

The K&N oil gets on the MAF sensor and triggers the EML.. Not a big deal and wont keep happening once the filters done some mileage.

Its best to leave it on mate, you dont see many RS with open filter setup for a reason.

 

Hi, I wish to thank you for all the good work you have done by compiling so much and putting all this info for freshers to this field like me to use.
great info keep rocking .

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THANKS GUYS FOR ALL YOUR HELP