On a n/a engine like the B6304, you actually can't do that much without major work. In opposite to the iron cast fours, this engine also is an effective design from the start - a significantly complicating fact.
I think there basically would be three modifications you could try:
1) better air filter (K&N or similar) and possibly a relocation of the air intake for better flow/colder air.
2) wider exhaust with straight-through mufflers, probably will have to be custom made but a side benefit will be the fantastic sound effect produced - inline six song is nothing but music to the ears :-)
3) chip tuning. Yes, there a-r-e chip's available for the 960/90 out there. Superchips (UK) maybe hasn't got the best reputation but are widely spread/used. A bunch of tuners sell/sold 960/90 chip's but my guess is they all originate from Superchips. Don't expect hundreds of wild horses to rush out, though - on a n/a engine the effect at it's best would be slightly improved responsiveness and maybe a higher set rev limiter. Usually, specs promise a 10-15 hp gain. High octane gas is a must.
Air filter and exhaust would increase the sound level, though - carefully think about this before modifying the car. If a high performance killer is your goal - buy a turbo car or turbocharge the six (yes, it's been done too) instead. Those are no low price mod's, though...
/Martin
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