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I was going to do some searching over at LS1tech on this subject but saw this thread. Wondering what the concensus is on pipe size. 2.5" from collectors out, or muffler out, 3" all the way?
I made my own long tube headers, with 30-36" tubes into 3 collectors. I can't run an X-pipe but can fit a H pipe about 10-12 inches behind the collectors and then run to dual mufflers, driveshaft loop and stance get in the way of an X-pipe. Also want to run exhaust all the way to the rear lower quarters and dump down, for the nice sleeper look.
Any advice on pipe size muffler selection for the quiet sound. 00 LS1/4L60e, Comp XR281HR/112LS 918 springs, LS6 intake, Fuddle 3200 TC, March underdrive dampner, 1 3/4 longtube headers,
66 100 series,LS1/4L60e,TCI,9" Currie,Tru-trac,4wh disc, Caltrac bars, VAir Gen IV, DDigital VHX dash.
Last edited by Duane; 18th-November-2012 at 11:41 PM.
I guess it depends on how much power your pushing out of your motor, but typically anything under 450 hp you don't need bigger than 2.5 inch unless you want it louder. I went mandrel bent from the collector all the way out the rear quarter panel to get the sleeper look. Mufflers have a play in the loudness too, I have one of the quietest muffler you could probably buy, but when I rev it or get on it, it sounds super good. Hope this helps..
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