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Silver00spike
09-23-2005, 05:35 PM
After the cats, I have dual 2.5" pipes going straight to a dual in and out magnaflow muffler. At partial throttle, under 3000rpms, there is a rediculous drone with a very deep sound coming into the cabin, and also heard from 3 blocks away.

The car has only about 200 miles on the exhaust, at which point is this supposed to get better? Do I need resonators, or do they serve another purpose?

What about some kind of electronic valve on each pipe that has a throttle like butterfly that is half open until I WOT, then it opens fully? Where do I find this?


By the way, after 3000rpm, full throttle sounds ABSOLUTELY SEX. Sounds like the devil gargling methanol

rotation
10-03-2005, 02:32 AM
I have a 332ti with the AA center pipe (cat delete) resonator going into the Rogue Engineering DMS mufflers, same droning issue.

So far I have learned to live with it... I will watch this thread to see if you find any creative solutions.

As far as the butterfly... I found these tips in a JC Whitney catalog... never tried them though.

http://www.jcwhitney.com/autoparts/Product/tf-Browse/s-10101/Pr-p_Product.CATENTRY_ID:2006288/showCustom-0/p-2006288/N-111+10201+600001736/c-10101

Silver00spike
10-05-2005, 07:41 AM
I have a 332ti with the AA center pipe (cat delete) resonator going into the Rogue Engineering DMS mufflers, same droning issue.

So far I have learned to live with it... I will watch this thread to see if you find any creative solutions.

As far as the butterfly... I found these tips in a JC Whitney catalog... never tried them though.

http://www.jcwhitney.com/autoparts/Product/tf-Browse/s-10101/Pr-p_Product.CATENTRY_ID:2006288/showCustom-0/p-2006288/N-111+10201+600001736/c-10101
you got another link, that one doesnt work

rotation
10-30-2005, 05:57 PM
The link works fine for me.

aceyx
10-30-2005, 07:48 PM
Here's the functional part:

pdxmotorhead
10-31-2005, 06:30 PM
Sure fire way to melt your cat down....
Likely burn valves.
Ruin O2 sensor.

Dave

Silver00spike
10-31-2005, 11:09 PM
Wow, thats EXACTLY what I was looking for. As long as it doesn't close all the way, it should be fine for the safety of the rest of your exhaust. I'm gonna ask them about it, and most likely order a set. Cheaper, and probably quieter then adding resonators. I'm guessing its spring loaded, opening more with greater pressure under heavier throttle. Even under Idle I'm pushing a lot of air, so I'm guessing it would keep it partially open

Silver00spike
10-31-2005, 11:13 PM
http://ultrafitexhaust.com/news_01_2001.htm

this link tells that in idle, its still partially open, but DOES hold gasses in the cat longer. This might become an issue with the more restricted stock exhaust, but in my situation it should be fine. I'll call the vice pres tomorrow as on the link