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Old 12-26-2012, 09:55 PM   #1 (permalink)
chevy dave
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Exhaust on 454 vortec

I have a 99 vortec with 3 inch dual exhaust with dual 40 flowmasters and the truck sounds good until the rpms get up then it gets really kakly. I don't want anything quieter just don't want the kackle what can I do to get rid of this? Thanks
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Old 12-27-2012, 12:27 AM   #2 (permalink)
Tommygunner
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Easist way if you dont want to get rid of your muffs is put a resonater behind the muffs. basicly they are just a short straight thru glass pack. Gets rid if the anoying drone and cackle and stil have a good throaty roar.
If you want new muffs IMO flowmaster 70 series sound better than 40 series on a BBC.
Adding a crossover or H pipe will also help too.
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Old 01-05-2013, 02:40 PM   #3 (permalink)
c502cid
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A crossover pipe of some kind will get rid of the big block nasty noise. The longer the exhaust the worse it is. My 84 has it bad too.
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Old 01-06-2013, 09:36 AM   #4 (permalink)
bigblue02hd
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Yep... Had 3" duals on my 8.1 with Flowmaster Delta Flow 40s and it got raspy as the RPMs went up. I cut in a custom H-pipe and it solved ALOT of that.....
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Old 01-09-2013, 07:30 PM   #5 (permalink)
chevy dave
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Big Blue 02 How did you get a H pipe in there If your exhaust is like mine it runs really close together may be you can put a pic of it on here. Thanks to all you guys for the info.
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Old 02-16-2013, 05:16 PM   #6 (permalink)
bigblue02hd
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Sorry for the late response....


Yeah it was tight... Mine was all home made.

My dual 3" headpipes were/are 4" OC. But ahead of my mufflers, I cut about a 6" section of pipe out of each bank. Then on the bench I took two pipes with 3" id ends on each end, and cut a short piece of 3" pipe to fit between them. I cut the sides out of each head pipe, fit the short 3" connector between them, and mig'd it all together.

I'll try and find some old pics of it.... It you still need them!?!
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Old 02-17-2013, 07:25 PM   #7 (permalink)
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That would be great thanks for all the info.
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Old 02-17-2013, 08:17 PM   #8 (permalink)
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Found this old pic....

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Old 02-22-2013, 10:09 PM   #9 (permalink)
chevy dave
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Thanks alot for the picture. It helps alot just couldn't picture how you were able to do it in with the exhaust running so close together but now I know I can do it. Thanks for all the help.
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Old 02-23-2013, 08:18 AM   #10 (permalink)
bigblue02hd
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No problem!

It's been A LONG time since I had that setup.... I don't remember that it completely removed all the raspiness, but it sure helped ALOT!
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