[Specwar]

Wow that sounds like a heck of a power plant.

The exhaust is still plenty there but the drone was greatly reduced and YES when you step on it still howls!

I would say it may be 15% quieter but the nagging drone is really reduced.

The rings and to cores don't come welded together so you can choose how many baffles and how to space them out (or buy a preset kit but I preferred the builders choose your own) but you are correct as to how they are welded in place within the exhaust tube.

They are regular steel but you can order them with a "coating" or just standard black.

Car Chemistry also offers packing material if you wanted to pack the space between to rings.

For your set up I would do a minimum double ring or even a triple if your drone is bad with all that HP.

Space them out differently. Maybe 2 baffles on one side and 3 baffles on the other or a 3/4 set up due to the increase power vs my 2.5 with minor mods.

They have flanged set ups too so you may be able to use them at the header exit point which works well for drone as well.

I hope that helps - let me know how it works out.