Nathaust Posted April 14, 2006 Share Posted April 14, 2006 Hi I have a fairly stock 240 turbo hybrid and I want to start upgrading it. Right now it is useing the stock t3 which I'm going to keep for now, possibly upgrading to a hybrid but I understand the exhaust side is the same anyway. It has the stock down pipe and 2.5inch exhaust running through some cat to a generic looking muffler. I've read the sticky about building up the engine and read a lot of your posts and it seems like a 3inch catless exhaust with a high flow muffler is best. Now to my question. MSA sells a 2.5 inch downpipe and the sticky faq recomends such but a lot of you run a 3 inch pipe. Is there much advantage to this considering the turbo output is less then 2.5inch? thx, John Quote Link to comment Share on other sites More sharing options...
Guest ON3GO Posted April 14, 2006 Share Posted April 14, 2006 understand that if you upgrade the turbo you most likely wont beable to use that MSA downpipe. its been talked about a few times and mostly everybody agrees on that 2.5in is more then fine for the stock turbo, and 3in is prob overkill for the stock turbo.. but once you upgrade the turbo its a different story. mike Quote Link to comment Share on other sites More sharing options...
Nathaust Posted April 15, 2006 Author Share Posted April 15, 2006 Isn't the exhaust side of the t3/t4 hybrid, which is the one I'm leaning towards, the same as the stock t3? Or do you mean that the MSA pipe would be restrictive at only 2.5inches? Quote Link to comment Share on other sites More sharing options...
thehelix112 Posted April 15, 2006 Share Posted April 15, 2006 Nathaust, From what i have heard, yes, there is benefit to having a larger diameter dump pipe than turbine outlet. As counterintuitive as this sounds I believe it is something to do with the vortex flow coming off the turbine wheel dropping over the lip (a sharp step up to a larger dia is what I have heard working, as opposed to a flare). I'm not a CFD expert by any means and I don't pretend to understand this fully. 3D flow problems make my head hurt. Just thought I'd mention it. Dave Quote Link to comment Share on other sites More sharing options...
Nathaust Posted April 15, 2006 Author Share Posted April 15, 2006 Where is a good place to get a 3" downpipe? It seems like most people have them custom made? Is this something a exhaust shop would do when I have the rest of the exhaust made? Quote Link to comment Share on other sites More sharing options...
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