There won't be a fat lot you can do with it I wouldn't have thought. I can't remember exactly what the specs and changes are over a standard 320 but I think it's fairly highly strung from the factory.
I like that,
Not sure whether you'd get anything from a remap, but as mentioned, without spending big money, there may not be much you can do.
It is a limited (2600 units) version of 3 Series saloon built to qualify the homologation requirement for the FIA World Touring Car Championship (WTCC). The 320si uses a modified 4-cylinder engine (N45) different from the standard 320i (N46). Modifications include an increased redline to 7.300 rpm, a shortened stroke (by 2 mm), an increased bore (by 1 mm) and a higher compression ratio (11,0:1). The engine is mostly hand-built and does not have Valvetronic, decreasing the number of moving parts. Acceleration from 0 to 100 km/h (62 mph) takes 8.1 seconds and acceleration in fourth gear from 80 km/h (50 mph) to 120 km/h (75 mph) takes 7.7 seconds compared with a standard 320i which achieves them in 9.0 and 9.1 seconds respectively. Fourth gear acceleration is comparable to that of the 325i which achieves the 80 to 120 km/h (50 to 75 mph) sprint in 7.5 seconds.
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Thanks guys much appreciated if money isn't the issue what would get done :P
Honestly though, this car was meant to be a homage to the earlier M cars and they were about simplicity and lightweight. Make sure it's got good tyres, is well set up and if you really want to get serious about it, strip some interior out. Chasing extra bhp on a naturally aspirated engine which is already kicking out significantly more than 'standard' is a fools (or rich man's) errand.