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Yes you can do this. The power and torque ratings you quote are for an automatic, the manual is 20/17. It is not quite the same specs as the IS - the IS adds a 7 sec overboost feature for short bursts of greater torque. I have this software and the BMW Performance Exhaust and the combo is super nice - really what BMW should deliver stock. Smooth power delivery and nice sounds.
Your car sounds nice, good luck. Investigate the BMW performance accessories but also know that you can get greater value with after market in terms of HP/$ spent. The BMW stuff is nicely done and is backed by BMW.
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Performance Center Delivery, June 21, 2013: 2013 E92 335is | Le Mans Blue | Gray Leather with Black | 6MT | 19" Style 313's | Michelin Pilot Super Sports | BMW Carbon Fiber Rear Spoiler | |