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I can fully understand the question. Here is what I dit in order of appearance:
1. aftermarket chip (very comparable to the SW chip): better driveability, better punch below 4.000rpm
2. replaced stock ceramic catalytic converter by 100cpi metal cat: big difference in overall performance, better sound
3. replaced stock airfilter with round filter and customer made adapter: more noise but due to the adapter slightly better midrange
4. installed headers, 2 100cpi cats and new muffler:again, big step forward
5. replaced 3.2l engine with 3.6l engine: much different caracter of the car with the higher torque at lower rpms
6. replaced the 3.6l engine with 3.8l engine: burned some unnecessary money...
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87 911 3.8l
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