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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
They will open up your exhaust flow a little bit.... but than get restricted by your stock mid pipe. If you have money get a midpipe also.
Ah, I saw "without cats" and was thinking it was already an aftermarket piece. Definetely change the mid pipe as well. Heck, if your going to do that, put on some long tubes and a matching midpipe.
Im not sure of your setup but unless you are pushing 350hp its not recommended that you run LT's anyway. I would get a set of BBK shorties and a BBK O/R H or X pipe.... that will make your car loud enough.
how did a stock midpipe come without cats? mine had 4! Anyhow Equal length shorty headers and off road midpipe! You'll gain a few HP and greatly improve sound.