Peugeot 405 sri running badly with 205 GTI exhaust manifold

Discussion in 'Peugeot 4xx' started by Christopher, May 20, 2017.

  1. Christopher


    May 20, 2017
    Likes Received:
    I bought a peugeot 205 GTI aftermarket manifold for my 405 sri (1989) and it doesen't run very well, It doesn't accelerate properly and feels like it is restricting the flow and the car hesitates and stays at a Set rpm for a second or two. I had to modify it quite a bit to get it to fit because of clearance issues, the diamiter of the branches got a bit smaller because It had to be hammered, cut and welded. The manifold was meant for 1.6 and 1.9 engines, the Pipe after the collector appeared to Be smaller than the stock one, not shure should that effect the performance too mutch.

    Just wondering did My modifying really effect the performance that mutch or could the manifold be unsuitable for my car.
    Christopher, May 20, 2017
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