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[Bojan]

So, last week i've finnaly installed a new custom exhaust.
Setup goes like this:
- cut-out everything between front exhaust hangers to the rear muffler (cats, centre sillencers and connecting pipeworks)
- installed one 300mm resonator (dual in-dual out, straigh trough), located approximatelly below the handbrake lever - I've done like this, so the length from the manifold to the resonator is similar to OEM manifold-to-cats length
- two 55mm pipes from central resonator to rear muffler

So, basically, it's still a true dual exhaust, but with one central straight trough resonator instead of two chambered central mufflers.

End result - well, it's loud - not the loudest in the world (sure the NASCAR cars are louder), but still very loud. However, the sound is very smooth, with no drone, and just a bit of rasp under hard acceleration around 3000RPM.

Sound is similar to CateraMV6 (was member here) setup:
https://youtu.be/jxcZ66-Bapc

And, NO, it didn't lose any low-end torque.

[Marks DTM Calib]

Its the cats that maintain most of the low end torque, the exhaust pulse reflection at this point being what pops the fuel/air mix back in the cylinder on the valve overlap.

Bugger around here and yes it will impact the power.

Hard fact is if you want to improve the exhaust on the Omega V6, you have to go after the manifolds which are a real compromise (the 2.6/3.2 are better but far from ideal)