Ok I get it. So just weld everything in chamber 1 and 3. And delete the fibergass in 1 and 3! Thanks!
I'm also running ER catless. So I think i place my midsilencer back... 1 series is very sensitive for drone when delete midsilencer
But i love the snap and crackles! I hope the muffler mod in combination with downpipe will make it loud and backfire a lot when midsilencer is replaced.