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*sigh* there's probably 3 or 4 active threads on this subject. loudest you can get is LM1 with o/r h-pipe. loudest/deepest you can get is LM2 with o/r h-pipe.
ANYTHING you put on a Cobra is gonna be loud if you use some LT headers and an X pipe. They are a must on Cobras.
long tubes arent a must on a cobra you lose power when putting them on, a good friend of mine put BBK lt's and a bbk x with a mac cat-back and lost 20 hp on the dyno, so in short keep the shorties