LTs make more power everywhere then Shorties...
Are LTs necessary? Well thats your call...
Installing LTs isn't exactly cake, they are big and bulky. If you have every installed any header, you know that they are bitch on mustangs... SO you can imagine how big of a PITA LTs can be. Furthermore, LTs will require a new mid pipe. So you aren't JUST buying the headers, but also a new mid pipe. On top of that, you need to worry about emissions. If you plan on passing legally, these may make that a tad more difficult in some states.
Yet, when it comes to performance and sound, Long Tubes are better then any other type of header.
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