Sounds like a decent deal - not spectacular, but fair
If it's got wood interior trim, it probably has the premium package, unless the previous owner added that after - most people actually pull the wood out for a different interior trim.
Regarding the Dinan chip, here's what their website says about it (adds 6 HP, 7 ft/lbs of TQ) - Dinan Performance Engine Software unleashes more power by re-programming the fuel mixture and ignition timing parameters of the engine management system. Furthermore, the software safely raises the rev-limit, giving your BMW a broader power band and greater road speed potential in each gear. Significant gains are also achieved at part throttle, making extra power available where you spend the bulk of the time driving. The top speed governor has also been eliminated, enabling the vehicle to achieve it's "natural" top speed.
Regarding the exhaust (5 HP, 4 ft/lbs of TQ) - Dinan's Free Flow Exhaust for the 3 series models provides increased flow for power gains without the excessive noise associated with typical "performance" mufflers. The Dinan exhausts feature rigid and durable muffler cases, manufactured from 20 gauge 304-stainless steel for optimum corrosion resistance. Internally, the systems feature Dinan's Tuned Resonance Chamber technology which provides the optimum balance between maximum power gains and a civilized, yet sporty exhaust note. The Dinan exhaust also provides substantial weight reduction compared to the stock muffler, weighing in at just over 17 lbs., compared to the stock system at 28 lbs. Dual 2.5 inch diameter polished stainless steel exhaust tips give the cars a tasteful performance look as well.
Most E46 (1999 - current 3 series) enthusiasts don't like Dinan because 1) it's very expensive, and 2) it doesn't provide the performance gains that other after market products do. But this car already has it, so who cares about that stuff.
They are great cars, good luck in your decision
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