[Luke87gt]

The 40 series is the classic 2-chamber Flowmaster that everyone knows.

As pointed out above, it’s a bit much for some (in term of sound and drone).

If you like want the classic Flowmaster chambered sound but you want to tone it down a bit, try something between 50-70 series.

Also, their “FlowFX” is a straight through muffler like a MagnaFlow. They flow well but don’t expect them to sound like what you expect a Flowmaster to sound like.

Good luck