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They're shite.
Welds crack, runners crack, flanges aren't flat, the link pipe puts the exhaust against the body, or on the floor. The manifold itself hits the subframe.
I'd want to check the timing is ok first. I can't see Renault running them that rich to start with, so it's more a question of why. Has a sensor gone down? Is the timing correct? Is the air inlet tract free of any restriction? Is the air filter clean?
That's very rich top end. Infact, it's sweet spot is 4500-4900rpm, then it goes too rich. Christ, that's running richer than I mapped my supercharged one lol
You're thinking of when they're fitted to the rs2.
When fitted to a stock inlet like Vikki's, here has gained about 5lb-ft across the range. The graphs are almost identical. But higher up the graph, and the power doesn't tail off.
They work well IMO. It's one of my favourite setups. But bare in mind they aren't time up normally. Only a handful of people are in the knowledge of how to do them properly.