I just chisles our my stock cat and drilled out baffles. On my stage one, someone said the cat is much easier to remove if I can get the inner housing out. Is the cat right on the top of the inner housing. Any tricks to take off inner part if it doesn’t want to move? Like a big clamp to twist it loose.
Have you considered selling the Stage 1's and buying a cheap set of stock pipes and then messing with those? Or maybe mess with those first before selling in case you don't like it and can go back to the Stage 1's?
Just seems like a waste to gut the expensive option pipes.