K7 VCT Posted March 12, 2019 Share Posted March 12, 2019 Hi all, my sigma car is having its exhaust polished along with decat pipe. Whats best way to remove and refit, as in which bolts to undo first and last and tightening sequence for refitting. Thanks all Julian Link to comment Share on other sites More sharing options...
elie boone Posted March 13, 2019 Share Posted March 13, 2019 Put it all loosely together before tightening any bolt. Link to comment Share on other sites More sharing options...
SM25T Posted March 13, 2019 Share Posted March 13, 2019 Julian ... do you mean the manifold to head bolts ? Do you have a one piece manifold or separate primaries ? Link to comment Share on other sites More sharing options...
K7 VCT Posted March 14, 2019 Author Share Posted March 14, 2019 Sigma 310, so silencer, cat and collector, and 4 primary pipes. Link to comment Share on other sites More sharing options...
John Vine Posted March 15, 2019 Share Posted March 15, 2019 It doesn't really matter in which order you undo (or tighten) the primary flange bolts.When reassembling, attach each primary loosely, attach and support the decat pipe (or cat) so that the collector sits squarely on the primaries, and then tighten the flange bolts to 34Nm.JV Link to comment Share on other sites More sharing options...
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