Check out the post in the FAQs section on 'exhaust researched'. A cheap intake improvement is to just buy a K&N dropin filter for your factory box.
Find the SOGI tech site on the net and you'll find a couple of things to do for no cost. I have an '89 n/a, and have done all external stuff except headers. I seemed to have gained about 20hp.
The MSD ignition didn't seem to make a difference.
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