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12-26-2012, 09:55 PM
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#1 (permalink) |
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Diesel Fanatic
Join Date: Aug 2010
Posts: 63
iTrader Score: 0 reviews
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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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12-27-2012, 12:27 AM
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#2 (permalink) |
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Diesel Master
Join Date: Feb 2010
Location: Northesat Nevada
Posts: 1,171
iTrader Score: 0 reviews
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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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The beauty of the Second Amendment is that it will not be needed until they try to take it. Earth First!!! We will mine the rest of the planets later. 1998 GMC K1500 6.5 62000 miles. Auto, 3.73 gears. Remote PMD mounted on the radiator support KOJO tune WOW ! Carter HD lift pump Ported upper intake. New Bosch injectors. 3 1/2" custom Aero turbine exhaust. Nutered Cat 2" Lift RS5000 Shocks. 285 X 17 BFG AT summer tires. 12.50 x 33 x 15 Procomp MTswinter. Powertrax No slip locker in rear. |
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01-05-2013, 02:40 PM
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#3 (permalink) |
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Diesel Enthusiast
Join Date: Sep 2006
Posts: 20
iTrader Score: 0 reviews
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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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2002 GMC 3500 4x4 CC/Dually 8.1 / Allison 1984 Chevy K30 4x4 CC/Dually 454 EFI / 4L80E 1972 GMC Jimmy 4x4 502 Ram Jet / Turbo 400 2010 Dodge 1500 4x4 CC 5.7 Hemi 1999 Dodge Durango 4x4 5.9 Old School 360 2000 Chevy Blazer 4x4 4.3 V6 1976 Chevy Corvette 350 / BW T-10 4 speed |
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01-06-2013, 09:36 AM
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#4 (permalink) |
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Diesel Technician
Join Date: Mar 2005
Location: Landenberg, PA
Posts: 428
iTrader Score: 0 reviews
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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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2002 2500HD 8.1/Ally/11.5/3.73 MAC/Edelbrock/Magnaflow/Blackbear/Cognito/Bilstein/Performance Accessories/Weld Racing/Toyo/Bushwacker/N-Fab/Kool-Vue/Recon
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02-16-2013, 05:16 PM
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#6 (permalink) |
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Diesel Technician
Join Date: Mar 2005
Location: Landenberg, PA
Posts: 428
iTrader Score: 0 reviews
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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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2002 2500HD 8.1/Ally/11.5/3.73 MAC/Edelbrock/Magnaflow/Blackbear/Cognito/Bilstein/Performance Accessories/Weld Racing/Toyo/Bushwacker/N-Fab/Kool-Vue/Recon
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02-17-2013, 08:17 PM
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#8 (permalink) |
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Diesel Technician
Join Date: Mar 2005
Location: Landenberg, PA
Posts: 428
iTrader Score: 0 reviews
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Found this old pic....
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2002 2500HD 8.1/Ally/11.5/3.73 MAC/Edelbrock/Magnaflow/Blackbear/Cognito/Bilstein/Performance Accessories/Weld Racing/Toyo/Bushwacker/N-Fab/Kool-Vue/Recon
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02-22-2013, 10:09 PM
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#9 (permalink) |
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Diesel Fanatic
Join Date: Aug 2010
Posts: 63
iTrader Score: 0 reviews
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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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02-23-2013, 08:18 AM
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#10 (permalink) |
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Diesel Technician
Join Date: Mar 2005
Location: Landenberg, PA
Posts: 428
iTrader Score: 0 reviews
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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!
__________________
2002 2500HD 8.1/Ally/11.5/3.73 MAC/Edelbrock/Magnaflow/Blackbear/Cognito/Bilstein/Performance Accessories/Weld Racing/Toyo/Bushwacker/N-Fab/Kool-Vue/Recon
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