Flapper Mod, Does it reduce Back pressure?

[Lukey13]

my custom exhaust with dsg sounds great. does a little flutter on gear changes. sounds awesome!

Out of interest, what's the standard pipe diameter and what diameter is your new setup?

[Big Yellow]

Yeah its good. Its not too bad. I think ive gotten used to it haha and my missus can fall asleep in the car so i dont think it bothers her.

Front section of stock exhaust is like a 2" pipe with a very flat collector after the cats which causes the most restrictions. Mine is chopped off here and made round and welded onto new catback. I think we went for 2.5" in the end with straight thru mufflers hence the loudness. Screams like a jet now