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for just installation, no, not even for the mufflers plus installation. mufflers at autozone should cost about 160 ish total, should be able to get them installed for around 25 bucks
if that's for the mufflers and the install, sounds all right. Flowmasters average $80-$100 each, and assuming they do a great job and weld the mufflers in that could justify the labor...... it's borderline too much, but if they do it well it's good..
my 1997 GT has those on it, and the guy I bought it from welded them in, and they sound great