rustler753 Posted July 25, 2017 Share Posted July 25, 2017 (edited) I have a dilemma and I am pulling my hair out over a 3" vs 2.5" exhaust for my 260z. I have a N/A L28 3.2L stroker, 11:1 compression, headwork and port matching, an MSA 3-2 header, weber 45s. I use the car on the track and street. This motor is still being broken in so I don't know what it will make yet on the dyno. I had a 3" nice exhaust made up and is currently on the car, but it is straight piped and insanely loud. I have two paths I can take; pick up a magnaflow 14867 (or maybe an oval type instead?) muffler and 18" vibrant 4" body resonator for the 3" system and keep it, or scrap it and have a 2.5" system made. The 3" vs 2.5" debate is mostly out of fear I went too large on the exhaust. I want to make sure I get it right. Can anyone help me put my mind to rest so I can stop obsessively searching online through countless forums? Edited July 25, 2017 by rustler753 Quote Link to comment Share on other sites More sharing options...
Neverdone Posted July 25, 2017 Share Posted July 25, 2017 Without a muffler, your car will be very very loud. Going down half an inch in pipe size won't fix that. Get the muffler for your 3". Quote Link to comment Share on other sites More sharing options...
rustler753 Posted July 25, 2017 Author Share Posted July 25, 2017 I was mostly thinking about the 3 vs 2.5 for the power/torque argument that people are saying the 3" is too big. Quote Link to comment Share on other sites More sharing options...
(goldfish) Posted July 26, 2017 Share Posted July 26, 2017 3" is not to big. Once past the headers it is really hard to go to big. Quote Link to comment Share on other sites More sharing options...
steve260z Posted July 27, 2017 Share Posted July 27, 2017 Quote Link to comment Share on other sites More sharing options...
Leon Posted July 27, 2017 Share Posted July 27, 2017 http://forums.hybridz.org/topic/81941-exhaust-tube-sizing-i-did-your-arithmetic-for-you/ Quote Link to comment Share on other sites More sharing options...
rturbo 930 Posted July 28, 2017 Share Posted July 28, 2017 http://forums.hybridz.org/topic/81941-exhaust-tube-sizing-i-did-your-arithmetic-for-you/ Photobucket strikes again... Quote Link to comment Share on other sites More sharing options...
Leon Posted July 28, 2017 Share Posted July 28, 2017 Photobucket strikes again... Regardless, there is tons of good info in that thread. Quote Link to comment Share on other sites More sharing options...
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