I can't say. I have no RR results to back up. It did change the noise though. I thought it added a bit of oomph when the engine was under stress (particularly on the motorway), but it could be placebo. I watched it being made, and it did appear to bend at less of an extreme angle than the standard downpipe so I can only imagine this improves airflow.
Something of interest is that I got the downpipe made so that the catalytic converter is inbetween a couple of flanges. You could get a straight through pipe made up to replace the cat (the cat is on bolts, and can just be unscrewed and a new pipe with flanges put in place). This was intended for MOT time when I got the decat, making it easy to replace the cat with a decat and vice versa, but as said I never got the pipe made up. I was quoted ?70 for the straight through pipe from Powerflow in Brighton, you could shop around.
HTH
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To do:- New tyres all round
- Aircon re-gas
- Replace/fix rattly mirror
- Mark 2 dashboard
- Catch tank
- New VIS motors
- Fit bucket seats
- Induction kit
- New spark plugs + oil change
- New exhaust
- Decat
- Fix drivers seat mounting hole
- Reidy Remap
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