Drone637 had a Thrush Turbo w 2 1/4" exhaust on his SJ410 1.3 L, and it sounded great. Quiet at low rpm and just throaty at higher rpm. I have dual Cherry Bomb Turbo's on my 2.7 and they sound good at low rpms, but above 2,500 rpm (on the road) it is loud and brash. Everyone close knows when I step on it. Not that bad on freeway, unless I step on it and it shifts down.
We have flattened out a few Turbo mufflers off road, and they all sounded good with our 4 cylinders. But mine are the first Cherry Bomb Turbo's we tried, and the first on the V6. My neighbors know when I am testing it, or in a hurry (so do those 1/4 mile away). I would stay away from them unless you want noise.