Supersprint has a Performance exhaust system available for the 2006-2008 BMW Z4 Roadster / Z4 Coupè 3.0si, equipped with the later generation N52 6 cyl. engine. The stainless, long primary tubular headers is the main component of the entire exhaust.
As I understand it, in US spec, the 2006 - 2008 3.0i and 3.0si produced 215 hp and 255 hp respectively, with the 2003 - 2005 3.0i cars making 225 hp. I know that in Europe, the 3.0si is 265 hp. I don't know the European spec outputs of the other cars, but you can probably add 5 to 10 hp over the North American output.

The Z4 is the successor to the popular Z3 that BMW produced for the 1996-2002 model years. It was a rear wheel drive sports car, with a variety of inline 6 cylinder engines ranging from 184hp all the way up to 330hp. E85 is the chassis designation from BMW for the convertible Z4 (2003-2008) and the M-Roadster (2006-2008).

Complete performance review and accelerations chart for BMW Z4 sDrive30i (man. 6) in 2011, the model with 2-door roadster with metal roof body and Line-6 2996 cm3 / 183 cui, 190 kW / 258 PS / 255 hp (ECE) engine offered up to July 2011 fro Europe . According to ProfessCarsâ„¢ estimation this BMW is capable of accelerating from 0 to 60 mph in 5.6 sec, from 0 to 100 km/h in 6.1 sec, from 0 to
BMW Z4. $ 99,200 - $ 139,800 * MRLP. A true driver’s car, the Z4 roadster is the epitome of drop-top driving pleasure. Boasting BMW’s trademark M Sport handling and dynamics, plus a soft-top
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bmw z4 e85 vs e89