Induction Kit or K&N type filter for S4 2.7

[kmm]

Has anyone fitted an induction kit or a K&N type filter to an S4 (B5) 2.7 bi-turbo. I had a K&N fitted to a previous turbo car and it seemed to work. It was the filter only that i changed using the original factory box.

Your views would be appreciated as i don't want to fit an induction kit to find that it sucks in the warm air from the engine bay. Do the performance filters make a difference on the S4.
Thanks
Kenny.

[Tame Technician]

I dont think there is much power to be gained on a forced induction engine by changing the air filter (Say 1%).

Also some people insist the filter oil on the performance filters damages the MAF sensors.

But we have a customer with a K&N element in the factory air box on a old 2.7 RS4 and I must admit it really does make the engine sound very nice. Deeper idle note, more induction noise on acceleration and you can hear the turbo's much more, sounds like its tuned alot more than it is. Depends what you want from the car I guess.

[kmm]

Thanks for your reply.... i didn't expect much performance gains, but a slight increase in engine/induction noise would be fine. The S4 is very quiet, even with a s/s from the cat back. Might try a filter, not too much money if i don't like it and go back to standard.

[ge0rge]

Ive read that they often have a negative effect drawing warm air from the engine unless you bother with a cold air supply & the modern vw/audi air boxes have been produced with max air flow efficiency in mind..

[kmm]

I've decided to go for a panel filter using the factory airbox set up. As mentioned, i was concerned that an induction system would suck in the warm engine bay air. I've ordered a K&N filter, only £38 delivered. I'll post up what i think and if i don't like it, look in the classifieds for one careful owner and nearly new K&N filter!!!

[kmm]

Filter arrived in the post the other day. Took 25mins to fit and that bottom clip is a pain. Old paper filter was fairly clean with under 3k miles since replaced. A few bit of leaves in the bottom of the air box. I haven't noticed any noise or performance gains, but at only £38 i know that i have a good filter in there.

[Defcon5]

kmm said:

i know that i have a good filter in there.

But is it any good? It may sound good, and look a quality part, but how good is it at actually filtering the air?

[kmm]

Defcon5 said:

kmm said:

i know that i have a good filter in there.

But is it any good? It may sound good, and look a quality part, but how good is it at actually filtering the air?

I would like to think that the K&N filter will filter the air to a standard equal or above an original filter. I may be totally wrong?

[Defcon5]

kmm said:

Defcon5 said:

kmm said:

i know that i have a good filter in there.

But is it any good? It may sound good, and look a quality part, but how good is it at actually filtering the air?

I would like to think that the K&N filter will filter the air to a standard equal or above an original filter. I may be totally wrong?

Holding one up to the light reveals some rather large holes IMO

[Jason182]

Heres similar to what i have done to mine:



I have to keep an eye the filter more often but there is a definite advantage of doing this mod, proven on a lot of the American and UK forums. I use the BMC panel filter, cant see any problems with it yet and that is after around 5-6000 miles.