Noz Posted March 8, 2012 Share Posted March 8, 2012 Currently have a 2.5" system. I have a 3" downpipe and 3" mid pipe, so its just the system that's holding me back on the exhaust flow. Was wondering if there is much gain going to 4" instead of 3". I'd like a different system as mine is too quiet, didn't know if there was a huge jump in performance between the two. Never owned such a system thought it best to ask. I want this to be the last time I swap them around so want to get it right! Quote Link to comment Share on other sites More sharing options...
Tyson Posted March 8, 2012 Share Posted March 8, 2012 What power are you hoping to make as I think this will be a deciding factor in which size you go for. Quote Link to comment Share on other sites More sharing options...
welshbuddy Posted March 8, 2012 Share Posted March 8, 2012 I'm sure 3" is good for 700bhp ain't it? Quote Link to comment Share on other sites More sharing options...
johnny g Posted March 8, 2012 Share Posted March 8, 2012 3" will see you well into the 700's Quote Link to comment Share on other sites More sharing options...
Noz Posted March 8, 2012 Author Share Posted March 8, 2012 Problem solved!! Quote Link to comment Share on other sites More sharing options...
Nic Posted March 8, 2012 Share Posted March 8, 2012 3" will also give you slightly better ground clearance. Quote Link to comment Share on other sites More sharing options...
Noz Posted March 8, 2012 Author Share Posted March 8, 2012 How come? I would of thought the 3" would be closer to the ground. Quote Link to comment Share on other sites More sharing options...
JamieP Posted March 8, 2012 Share Posted March 8, 2012 How come? I would of thought the 3" would be closer to the ground. Really? Quote Link to comment Share on other sites More sharing options...
Littler Posted March 8, 2012 Share Posted March 8, 2012 How come? I would of thought the 3" would be closer to the ground. I think Nic's comparing the ground clearance between 3" and 4" rather than 3" and 2.5" Quote Link to comment Share on other sites More sharing options...
CanisLupus Posted March 8, 2012 Share Posted March 8, 2012 Here you go: http://www.modified.com/tech/modp-1102-exhaust-test-tech/index.html and http://www.supraforums.com/forum/showthread.php?280947-CLASH-OF-THE-TITANS-II-brought-to-you-by-SP-Engineering Be the judge what suits best for your needs Quote Link to comment Share on other sites More sharing options...
Noz Posted March 8, 2012 Author Share Posted March 8, 2012 Really? I thought Nic meant against my current 2.5" system, mis-read it Quote Link to comment Share on other sites More sharing options...
Noz Posted March 8, 2012 Author Share Posted March 8, 2012 Here you go: http://www.modified.com/tech/modp-1102-exhaust-test-tech/index.html and http://www.supraforums.com/forum/showthread.php?280947-CLASH-OF-THE-TITANS-II-brought-to-you-by-SP-Engineering Be the judge what suits best for your needs The second link gives the impression that lower boost applications benifit from less restriction more. I would of thought higher boost applications having a larger volume of air would of had a bigger difference with larger bore piping. Quote Link to comment Share on other sites More sharing options...
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