Mufflers are a tough subject cause it's all upto the user .. I mean every mustang has flowmasters on em.. and I like the sound.. mine had flowmasters when I bought the car.... I dont mind it.. I took off the cats and the car is LOUD... some people like that.. others prefer quieter cars... something like dynomax might be up your alley...
as for the headers... I bought myself a set of used BBK Shorty headers and then I realised if I'm goign to take the time to do headers I might as well put in some long tubes, cause there's where you'll see the most power gain... specialy on the low end... or so they say... headers arent a HARD job.. just time consuming... so I'd rather just do em once... so I guess technicaly I have a set of BBK shorties for sale... 
If you do go with headers you have to get the H pipe to match... long tubes are longer a therefore the H pipe is shorter and visa versa
-as
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'89 GT Convertible:
TFS TW Heads, TFS Street Intake, TFS Stage 1 Cam, FMS 1.6 RRs, 24# Injectors, Pro-M 75mm MAF, No Name CAI, 3.73s, O/R H-Pipe, FlowMasters, AOD w/ Trans-Go Shift Kit
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