sam93 Posted February 9, 2016 Share Posted February 9, 2016 Hello all,The exhaust manifold downpipe on my GT6 Mk3 is in dire need of replacement. Apologies in advance however I couldn't find the information that I wanted from previous threads. To keep it simple I've got a list of questions I'd like your thoughts on. Currently I've got the standard manifold & downpipe with a stainless centre section, y split & two boxes. I'm thinking of replacing it with a Maniflow exhaust manifold & either re-using the stainless bits that I've got or using the Canley classics single pipe big bore system. See links. As far as build quality goes, the maniflow manifold looks 100x better quality than the phoenix or rimmer equivalents.Questions.Has anyone had any experience with this maniflow exhaust manifold ? http://www.maniflow.co.uk/index.php?view=product&from=204&product=1518Same question but for the canleys big bore system ? http://www.canleyclassics.com/engine/large-bore-straight-through-stainless-steel-exhaust-systemThe intake is provided through twin CDSE 150 Stromberg carbs, am I likely to upset the current tune by fitting a better gas flowing system? Thanks for your input. Quote Link to comment Share on other sites More sharing options...
rotoflex Posted February 10, 2016 Share Posted February 10, 2016 Quoted from sam93 As far as build quality goes, the maniflow manifold looks 100x better quality than the phoenix or rimmer equivalents.Questions.Has anyone had any experience with this maniflow exhaust manifold ? http://www.maniflow.co.uk/index.php?view=product&from=204&product=1518 Is the conventional wisdom not that the 6-3-1 configuration is superior for performance over the 6-2-1? The Maniflow system appears to be 6-2-1. Quote Link to comment Share on other sites More sharing options...
Clive Posted February 10, 2016 Share Posted February 10, 2016 Indeed, the maniflow seems to be a build a simple to fit design, rather than one that improves efficiency. primary lengths certainly are not equal.Bell do a tidy 6>2>1 and if that is what you want, then you ought to have a look at it.As to affecting tune, a decent exhaust certainly should affect gasflow and need a needle change. If it doesn't, you have wasted your money! Quote Link to comment Share on other sites More sharing options...
CHRIS211083 Posted February 10, 2016 Share Posted February 10, 2016 2" large bore can be noisy. Cliftyhanger has my plus 1.Chris. Quote Link to comment Share on other sites More sharing options...
CharliesStag Posted February 17, 2016 Share Posted February 17, 2016 I was under the impression that many of the aftermarket systems were not that big an improvement since there was more to it than just it having 2 or 3 secondary pipes ; collectors for instance played a part. Didn't someone once show that one of the stock manifolds was better than a tubular item? While Mike the Pipe and a certain man known as GT are known for making great systems both are in short supply and the latter very expensive.I cannot comment beyond that however. The Maniflow system does seem to have a half decent collector mine you. Quote Link to comment Share on other sites More sharing options...
Martin M Posted February 18, 2016 Share Posted February 18, 2016 Moss sells a mild steel one. TT 1740X. Much better than the Phoenix I had before.Martin Quote Link to comment Share on other sites More sharing options...
Nick Jones Posted February 18, 2016 Share Posted February 18, 2016 Mike the Pipe won't be making any more....... he left us some years ago.The Moss one Martin references is the closest modern equivalent. Don't know if it's still being made or is a "while stocks last" thing.You can get pretty good results from a TR5/6 twin outlet cast one (as shown on my old PI) but would a sod to fit on a small chassis car due to the orientation of the outlets (across rather than along the car)Nick Quote Link to comment Share on other sites More sharing options...
uksnatcher Posted February 18, 2016 Share Posted February 18, 2016 Not sure about the 6 pot but dont you HAVE to do a camshaft upgrade as well as needle/air filter/tuneup when you add an extractor manifold or is it just a mild performance upgrade with just the manifold? Quote Link to comment Share on other sites More sharing options...
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