Not knowing what modifications you presently have, or where you want to go with your Mustang it's hard to say.
If you plan on doing any mild mods to your car, a complete exhaust system is always nice. And, yes, the stock headers are very restrictive.
Mods cost money. You just have to determine where you want your car to end up, then we can really help you pick and choose the right combination of parts that will achieve the desired result.
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1991 5.0 LX Coupe - 40,750 miles
331 cu. in. / Tremec 3550 / BFG Drag Radials
12.22 @ 114.31 mph - w/1.89 60'
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