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(Post Link) post #1 of 8 Old 15-01-09 Thread Starter
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Which k&N ?

Quick question on the K&N filters ...

I am looking at the 57i kit and the NORMAL K&N replacement filter

It seems using the 57i kit on my alfa 147 will not be 100% legal ...using the K&N Performance Air Filters (replacing the original) will be no legal issue ...
Question ...Will I get the nice sound from he latter as well or only on the K&N 57i induction kit?


Thanks
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Re: Which k&N ?

With the replacement panel filter you will not get the induction roar like you get on the 571
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Re: Which k&N ?

you wont get the heat soak and drop in performance with the panel either
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(Post Link) post #4 of 8 Old 16-01-09 Thread Starter
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Re: Which k&N ?

Right u are :O)

So what is your advice ? buy the Normal ?
What dip in performance ? ....heat soak ?

please explain
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Re: Which k&N ?

indeed heat soak is the problem with exposed filters.

the favoured filter on here seems to be the BMC CDA and I found it very impressive on my 147. Its a carbon fiber enclosed kit but comes with a price!

If you have the money then I would say go BMC CDA but if your on a budget then stick with a drop in panel filter. K&N, Pipercross and ITG all do decent panels.

Remember also that the BMC CDA can always be removed when you change the car and fitted to your next car(s).
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Re: Which k&N ?

Quote:
Originally Posted by contact303 View Post
Right u are :O)

So what is your advice ? buy the Normal ?
What dip in performance ? ....heat soak ?

please explain
When standing still and/or driving slowly, the engine will suck hot air from under the bonnet with the 57i kit.... Hot air is less dense then cold air, hence you actually get a performance loss instead of an improvement....
(unless you add shielding and cold air ducting...)

On another note, nobody is going to make problems about a 57i kit in The Netherland, legal wise...
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Re: Which k&N ?

Quote:
Originally Posted by contact303 View Post
Right u are :O)

So what is your advice ? buy the Normal ?
What dip in performance ? ....heat soak ?

please explain
Hi c303,

Others will correct me if I am wrong, however I believe 'heat soak' refers to exposed/cone filters drawing in hot, under-bonnet air, as a result of their placement. Since the hotter the air, the less oxygen it contains this causes the 'dip in performance'. I cannot give any proof or figures, although I believe there are other threads around here somewhere.
I believe there are some vendors who offer 'heat shields' for their exposed filters.
Proost!
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(Post Link) post #8 of 8 Old 16-01-09 Thread Starter
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Re: Which k&N ?

MHH ok thanks maybee i just stay panel filter then ...
Just the engine sounds like it would sound so much nicer if not so muffeled
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