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I have Agency Power downpipes which look similar to your downpipes pictured here. I am running a stock exhaust with my downpipes and it sounds like an E46 M3 but a little richer. I don't want a very loud car so I most likely will never get a new exhaust system.
Yours will be much louder since you have an after market exhaust system but shouldn't be too bad.
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2008 BMW 335i e92-Agency Power DP's, Cobb stage 2, BMS DCI, BMW Performance Wheels
-Previously Owned-
2005 Volvo S60R (SOLD)-3.5" downpipe, 3" straight pipe all the way out, IPD custom tune, IPD Intake, AEM Methanol Injection Kit, Bell Intercooler, custom 4-guage piller pod.....best 1/4: 12.9 @ 111
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