Are the flowmaster 10 series the same as the Flowmaster delta force one chamber race muffler?

 

from what ive seen, there is a 10 series 1 chamber and a delta flow one chamber... which are significantly larger and heavier in size. im running the normal 10 series 1 chamber they are illegal here and insanely obnoxious.. always nice when you drown out LM1's HAHA

 

So the 10 series are louder than delta flow?