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Re: B-body Hemi mufflers performance vs. aftermarket
[Re: Streetwize]
#227361
02/18/09 08:31 PM
02/18/09 08:31 PM
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Joined: Apr 2005
Posts: 15,134 Kelowna, B.C. Canada
DPelletier
I Live Here
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I Live Here
Joined: Apr 2005
Posts: 15,134
Kelowna, B.C. Canada
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Quote:
Ultraflows can be fairly mellow at idle on milder motors without a lot of compression and especially without a lot of cam overlap. When you go big cubes, high compression and long duration they tend to get a bit louder.
I went with the Dynomax Hemi Mufflers because with big cubes, 12:1 and a big cam I felt the Ultraflows would be a "touch too much" for the neighborhood and town I live in. The Hemis are 3" all the way through and flow well, at least on par with the shorties. I believe the OEM style Hemi's are 2 1/2 to 2 1/4 ID, but I believe Accurate may make a 3" internal.
Here's a sound clip with 3" dmax Hemis:
http://www.youtube.com/watch?v=jd8GeXYYkKU&feature=channel_page
That sounds great!
I was going by what the other guys with similar setups were saying; 440, 10.75:1, stock(ish) legal cam, iron manifolds = fairly quiet, esp. at idle.
If not......the only neighbors I have are deer!
Cheers, Dave
1970 Super Bee 440 Six Pack
1974 'Cuda
2008 Ram 3500 Diesel
2006 Ram 3500 Diesel
2004.5 Ram 2500 Diesel
2003 Ram 3500 Diesel
2006 Durango Limited
[url] http://1970superbee.piczo.com [/url]
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