Glasspacks, at least perforated cores, flow about as well as any muffler you can buy. Sure after a few weeks it gets so loud it's like it's not there, but I'd rather have one than a Flowmaster. I put off-brand Flows on my C10 replacing Red Hots, and it made so much drone it was unreal, it was like a 12" sub constantly hitting, it was pretty much undriveable. The glasspacks were overall louder outside but they were a ton quieter inside the truck.
I'm considering replacing the 18" Magnaflow on my truck, since it has no cat it's pretty loud. I may try a Dynomax Super Turbo, those are supposed to be quiet but flow very well, the next best thing to straight through, and they're cheap for what you get.
I'm considering replacing the 18" Magnaflow on my truck, since it has no cat it's pretty loud. I may try a Dynomax Super Turbo, those are supposed to be quiet but flow very well, the next best thing to straight through, and they're cheap for what you get.
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