Luckily since these exhausts are all hand made we sort of have a solution for that. There are too many variances of turbo kits to have one option to fit all. So what I usually do for people with single turbo looking to get rid of the split connection is I'll have my fabricators make the front connection a 3.5" V band connection and then I'll ship it with the other half of the v band flange and a couple feet of 3.5" tubing(if desired) so they can have the downpipe section fabricated locally. So far I have done that for 3 people with the 135 systems.
I have also done options like muffler delete, ceramic coated or blue'd exhaust tips.
Blue'd tips and muffler delete on 135 system:
Black Ceramic coated tips on 135: