3" quiet true duals
01-10-2019, 09:19 PM
#21
I had some 2" mandrel and a v bend left over from a waste gate project, so I but a J pipe/ hemholtz of about 39" on the Tahoe with the 6.2 muffler and dyno max bullet. I feel like it helped, but I have limited experience with that setup on the highway before the J pipe.
My G8 with AFM and no J pipes droned baaaaad in V4 mode, so I genuinely think J pipes help.
My G8 with AFM and no J pipes droned baaaaad in V4 mode, so I genuinely think J pipes help.
01-11-2019, 11:06 AM
#22
I kept the Pro-Flo muffler just in case I can't fix the drone but I'm going to have J-pipes installed. I was thinking since it's dual in dual out, I'd make a J-tube on each outlet pipe for different frequencies. I simplified the equation for length that you find online and included the conversion to inches. It's 50639.79 / RPM = L in inches. Mine resonates between 1800 and 2200 rpm the worst. I'm considering a 28" pipe and a 23" pipe. I should have that done next week.
01-11-2019, 11:08 AM
#23
I had some 2" mandrel and a v bend left over from a waste gate project, so I but a J pipe/ hemholtz of about 39" on the Tahoe with the 6.2 muffler and dyno max bullet. I feel like it helped, but I have limited experience with that setup on the highway before the J pipe.
My G8 with AFM and no J pipes droned baaaaad in V4 mode, so I genuinely think J pipes help.
My G8 with AFM and no J pipes droned baaaaad in V4 mode, so I genuinely think J pipes help.
01-21-2019, 11:16 AM
#25
Launching!
Join Date: Oct 2002
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On my 6.0L with longtubes , no cats with dual 3 inch exhaust, I have 2 12" bullet mufflers followed by 2 12589 magnaflow mufflers, no drone almost too quiet but was the only way I was able to eliminate drone.
02-12-2019, 03:26 PM
#26
I finally got that Flo-Pro 2500 installed. THe shop misunderstood me and left both tailpipes on. At Idle it only flows from 1 pipe but under acceleration it flows from both. It's as quiet as a mouse. It definitely cost me some top end power but it feels plenty strong driving around. I'll probably even install a smaller cam to get more low end torque and put the 3.42s back in and just drive it. Anyway, I just thought I'd post the results since I started the thread. I'm happy with the quiet but sad that it's less of a hot rod now. Wifey will be happy to ride in it now so that's good.
02-12-2019, 08:04 PM
#27
Talked to a buddy about this recently and he finally ended up stacking 2 magnaflows back to back to get it right. Be near impossible on yours and 4 mufflers would be expensive.
I've also always been a big fan of installing resonators when things are a little out of control.
You never mentioned if the cats helped any..?
I've also always been a big fan of installing resonators when things are a little out of control.
You never mentioned if the cats helped any..?
02-13-2019, 11:41 AM
#28
The cats made a very small difference in the sound and seem to have eliminated the fuel smell once warmed up. I also raised the truck a few inches and that made a bit of a difference but the drone at highway speed was still way too bad. Now, I can hear the lifters. If I put a smaller cam in, It'll be a total sleeper.
02-14-2019, 11:06 AM
#29
The cats made a very small difference in the sound and seem to have eliminated the fuel smell once warmed up. I also raised the truck a few inches and that made a bit of a difference but the drone at highway speed was still way too bad. Now, I can hear the lifters. If I put a smaller cam in, It'll be a total sleeper.
Cam size isn't usually the noise maker, it's the lobe profile or the setup. Either way going to a smaller cam sounds sad man, don't do that lol
02-14-2019, 02:04 PM
#30
I know, I might or might not. I like the idea of having some torque below 2000 rpm. With my manual transmission I could really use that. The cool thing about having the 5 speed is that I can use the higher RPM torque instead if I want to and now with this muffler, it doesn't sound offensive to the whole neighborhood if I rev it out a bit.
