if you've got a 156 I reckon the following would be a better option.... Find some euro 2 2.5 v6 manifolds and modify them to accept the pre cat lambdas, then hook them up to this front pipe set up: http://i46.photobucket.com/albums/f1...it/header3.jpg http://i46.photobucket.com/albums/f1...it/header1.jpg Attach it to a decat and then a custom set up ala Chrish's suggestion http://i62.photobucket.com/albums/h8...a/DSC_0039.jpg I reckon around 1.5k including a remap if you do it yourself.