mustang exhaust

so i just had my cat back repaired with some flowmasters.
i had flowmasters on it previously, and they sounded better with 2 huge rust holes in them.
it sounds completely dead bone ass stock with these new ones.
extremely quiet.
i still have cats on it.
will removing the cats make a big difference.
 
Yeah make sure they wre installed with the flow in the correct direction. There should be a noticable difference over stock with just the flows.....Taking off the cats will make a significant difference in sound. Which flows are they, how many chamber....2 or single chamber should be pretty loud...3 chamber are kinda quiet.
 
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