I have a K&N drop in filter replacement in my MC. I am not sure much power was added. I did consider a 57i or intake, but was concerned about air temp. There are several companies supplying drop-in filters:K&N, Green Cotton Filters, BMC AirFilters.
I found the exhaust mod was better. Better sound and response.
Got a pipercross drop-in, which can't be too different from the K&N. Marginally response all round, marginally better pull from 3k, more definate kick at 4-4.2k. Not too much difference in noise, maybe a bit deeper.... overall worth the pennies.
I have Phase 2 Superchipped One with straight through exhaust- I fitted K & N replacement panel filter and notice quite an improvement low down in rev range- engine is more reponsive and they certaintly seems to be more torque- you can hear the difference too- as already said well worth the money spent.
i've just put in a K&N panel filter & although i don't think it does anything for power low down the rev range it definately feels to rev more freely & it seems to acheive 70-80mph at about 200-400 rpm lower than previously
yeh, Hat, you're well wrong! there's no way that a filter can give u rev drop at a set speed. it's all to do with gearing so either u have put on massively bigger wheels or your imagination is running wild!!
even if you gave your car an extra 150bhp it would still spin at the same engine speed for a given road speed.
back to issue: i have a 57i and torque seems the same low down. it's feels a wee bit stronger from 4000 to 6000 but it's probs the noise making it feel faster rather than actually being faster.
i managed to leave the cold air feed pipe from the standard air box on and it feeds straight on to the 57i. it needs a bit of bending and a couple of tie raps to hold it in the perfect place but it does mean you get cooler air onto the filter. the 57i instructions show to remove the pipe.
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