I have hear the naked-metal version (with blue heat marks) of that pipe and it DOES NOTHING to abate sound. It would sound exactly like the header without the part you are wondering about
It is nearly identical to my $16 pipe below in extreme noise, but ZERO droning in my helmet, so the rest...
See if it will start without using the throttle, and then make sure the idle is not too high after it warms up, make sure it has a high idle circuit that is working and then goes to low idle
You can get way better mileage with a 17-39 setup, and it also fixes any overheating issues 100%.
A bit tall gearing for short stop signs , but awesome on highway
Any full system like that will be even more open, or similar to what you have. I highly recommend just getting the FlashTune stuff and do it yourself. The so-called Ivan flash is a very simple mod to s stock map that I can show you via email.
if you want incredible acceleration without wheelies, get a 15 front. it makes highway awful, but unreal street racing from light to light .
a 14-54 setup allows 180kph top end, and unbelievable launches. most street race is to 180kph or so