A tuned exhaust will help any ICE. I drove diesel VW Rabbits for years, and was likely the first to install a Techtonics Tuning exhaust system on it. It definitely helped in the performance arena, and it was no louder than stock.
Turbo engines can often get by without a muffler, as the turbo tends to muffle the exhaust note. This is a good comparison, but not all flavors are included.
V6Z24 | How-To - Choosing a muffler I had personally wished they had tried Flowmaster's racing delta 40s, but oh well.