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Cold air intake,aftermarket exhaust, let her breathe! First things I did to my '89. You can tune the IP,but its recommended that you get a pyrometer and watch those exhaust temps.
Also could invest into a pair of moose misters, and a baby moose pump, a cam upgrade, stud the heads, there are a variety up upgraded injector pumps available for a pretty penny, a more flowable intake
i have it cut off behind the cab because the person that had it before me put glasspaks on it, and i plan to put headers on it
i was also wondering what the best way would be to make a custom intake