Catless downpipes are going to sound very similar. Its a major improvement over stock.
If you want the loudest setup, you have to do downpipe + catback exhaust combo
I agree with Active Autowerke. No power difference between catless and a high flow catted downpipe for stage 1 or stage 2 applications.
You might be able to get an additional 20 whp with catless on custom-tuned stage 2 map, but that's about it
If you are looking for a downpipe that does not throw CEL, Active autowerks chatted is the way to go.
In terms of power, sound, and fitment, all proven brand will perform the same
We offer Acitve Autowerke, VRSF, CTS,etc...