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kens_74_911s's Avatar
 
Join Date: Apr 2010
Location: Southern Pines, NC
Posts: 1,095
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Custom Dual muffler exhaust for early 911

Thinking about building this, what do you guys think ? I have the model in solid works and may need to tweak it slant the pair of turbo mufflers a bit to get the height right. they measure NOM 4" wide 9.5 in height . Looking to run a more open pipe but still keep it not to loud & still route it through my existing lower bumper extensions. It may need to something special at the center rear lower panel. Having several early 911 cars with Webers I learned early on they really have the capacity to flow well and generate power when the pipe is un corked -free. problem is you generate a lot of noise that way I have done a few stock pipes into sport pipes that were separated down the center and with the Webers its a nice way to isolate any issues idle jets or sync tuning.
These are 2.5 dia mufflers designed for larger displacements like a V8 so planning on flairing the 2" up on the way in and keep outlets 2.5dia.
as I type I have also revised it to keep the pair centered and have both inlets low - flipped the inner muffler close to the motor .



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Ken - ebay: wandrey1 , *0 , *00 , *01
74 911s NA Widebody /96 BMW 750iL /99 BMW 328i/ 2018 BMW X3
81 VW Caddy Pickup X2 now...
84,85x2 .86,87,944. 82-924,88-924s parted with inventory!
68, 70, 72, 73, 911~ 70,73 914 past P/cars
Old 04-29-2010, 12:31 PM
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Join Date: Oct 2001
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Will that fit, and isn't it going to be a tad heavy. I went the two in two out magnaflow style muffler and hated it as it was too loud and droned. Added some 8 inch glass packs to each side and it worked out great. Lots of posts and variations on this.
Cool mock up though.
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72 911
Although it is done at the moment, it will never be finished.
Old 04-29-2010, 12:44 PM
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They are actually pretty light considering they are the “exhaust” and the only real weight in the system other than some thin wall tubing and the flanges . There is some engineering that went into the turbo muffler baffles I wanted to test. Also they were inexpensive when I snatched them on sale.
I suspect this thread will have some interesting inputs do to taking a path not normally traveled...

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Ken - ebay: wandrey1 , *0 , *00 , *01
74 911s NA Widebody /96 BMW 750iL /99 BMW 328i/ 2018 BMW X3
81 VW Caddy Pickup X2 now...
84,85x2 .86,87,944. 82-924,88-924s parted with inventory!
68, 70, 72, 73, 911~ 70,73 914 past P/cars
Old 04-29-2010, 01:47 PM
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