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Never fitted it in my conversion yet and was wondering if it needs to go into both pipes eg fit a collector or would it do in just one pipe. And what would the difference in power with or without it

It needs the lambda to run properly. You need to weld a bung after where the exhaust joins into one pipe.

Good man. But was just wondering how much difference there is with and without it. Does it cut the power or not rev as quick.

Nah itd go in limp mode and it drinks fuel and probably won't pass emissions. I use the m52 now that has two lambda one in each exhaust manifold.

You got the exhaust done yet?