Check the other bimmer website. There is a guy that just installed an hks system on his. He also has sound clips posted. Good price, great looking, great construction, but some people dont like that its a japanese company. But has also produced the most power out of any system for 335. And hks is a turbo performance oriented company that is well known for quality. NICE CAR BY THE WAY.
I highly suggest the Active Autowerke system for this car. We are running it on our 335 and it provides an impressive improvement in sound and performance without being too overbearing for daily use. It's also a complete cat back system so you replace both the muffler and center piping making it 100% bolt on.
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