[To B(mw) or not to B(mw)]

As the tag would suggest contemplating a BMW. Specifically a 340i xdrive with both M performance packages, but on the test drive the road noise was atrocious on the highway.

I suspect that this is largely the runflat tires. The C43 I test drove was similarly loud on the highway and it too has runflats. The A4, on go-flats is much quieter -- yes different car and all but still. S4 is out of contention because of the fixed headrests, not safe for someone of my height to prevent whiplash.

I was wondering if anyone in the area has a 3-series (340 would be fantastic) that they ditched the runflats on and would be willing to give me a ride to see if that takes the road noise down to an acceptable level. A bit of an unusual request but if anyone could help me out...

Thanks

[To B(mw) or not to B(mw)]

Another question, has anyone ever measure the decibels in the car with both runflats and non-runflats on the same road/speed? The type of non-runflat will affect the sound levels but would be interesting, some numbers instead of the anecdotal 'much quieter and smoother'.

[the dope steez]

I can, but I'm on 19s with KW street comforts so probably not a perfectly comparable test...

[To B(mw) or not to B(mw)]

Actually that'd probably work, the ride quality will be different, but the the KW street comforts shouldn't alter the road noise.

[the dope steez]

Originally Posted by To B(mw) or not to B(mw)

Actually that'd probably work, the ride quality will be different, but the the KW street comforts shouldn't alter the road noise.

Alright send me a PM

[Taunto]

Side Note - Not meaning to get off topic

Anyone have(or know of anyone) with a 440 and is looking for a fairly new M-Performance Exhaust with the sound kit (muffler, mid pipe, and resonator delete) please send me a PM. Have one for sale. Will sell to anyone in the Alberta area.
Not 100% sure if it fits 435, 335,340 tho.. would half to do some research on that.

[Arthurrs]

I noticed an audible difference/improvement with regards to road noise in my 2014 328ix when I changed my run flats to 18" Michelin Pilot Super Sport 4S tires! Handles a lot better as well. Well worth the investment IMHO.