I recently bought a '71 Blazer with an LT4. It is a stock crate engine with stainless headers into a 3" dual exhaust with X pipe. Has Magnaflows on it and tailpipes all the way straight out the back. Sounds great at idle, but is so loud under even medium throttle, something needs to done about it.
I am not up to date on what the go-to mufflers are for those of us who want a reasonable sound level inside and for the neighbors when I leave home.
Seems to me I read something somewhere that Hooker Blackhearts might be what I'm looking for. While I want some rumble, pretty much the quieter the better.
Thanks for any help on this.
They look like they are the 5x8x18 size. Can’t measure them right now but based in the 3” pipe size, they look like that size to me.
Can’t go much if any thicker as the truck lays frame. Could add cats or resonators if they would provide significant sound reduction.
No personal experienc, but testing and other people's reports I have seen says Borla Pro XS will be your best bet for quiet and power. I have seen a couple posts from people on other sites about blackheart being too loud for their tastes.
I recently bought a '71 Blazer with an LT4. It is a stock crate engine with stainless headers into a 3" dual exhaust with X pipe. Has Magnaflows on it and tailpipes all the way straight out the back. Sounds great at idle, but is so loud under even medium throttle, something needs to done about it.
I am not up to date on what the go-to mufflers are for those of us who want a reasonable sound level inside and for the neighbors when I leave home.
Seems to me I read something somewhere that Hooker Blackhearts might be what I'm looking for. While I want some rumble, pretty much the quieter the better.
Thanks for any help on this.
Running stock lt4 with black heart exhaust 3” x pipe etc and I had the opposite problem as you - the black heart system is great but was too quiet with resonators so I cut them out and they work great - so yes resonators
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Unfortunately it's the 3" exhaust that's getting you. I've run into the same issue with my car.
I ended up putting 3" high flow magnaflow cats on the collectors of my longtubes and it greatly reduced the sound level in the car, can carry on conversations easily while cruising now. I am also running an Elgin E1839P cam, has a lot of overlap, and the exhaust stank at idle, the cats cleaned it up, don't smell like I mowed the lawn after driving around now.
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Another thing to consider is a blazer is not the same as a car or a pickup, as the passenger compartment extends all the way to the back bumper. Cars and Pickups have a separation from the exhaust tips. Insulation in the floor of the bed is essential to deadening the sound. I had a 76 blazer with no sound deadening. It sat 4" off the ground and had cam with a lot of overlap and the old flowmaster 5 chambers on it dumpt to the ground in front of the rear end. You could carry on conversation in it. all though it did set off every car alarm I passed.
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Help quiet down this LT4 please
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