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4" downpipe split into duals

Old 10-10-2018, 03:29 PM
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Default 4" downpipe split into duals

I am running a LQ4 with a t6 1.10A/R s475, with a goal of 650 to the wheels, with a 4" downpipe and need/want to split it into duals to be able to run it out the back of my truck. It is going to just be a street truck and don't want the noise and drone under the cab. If I split it into dual 2.5" will that kill the flow? I could possibly step it up to 3" but will have to get creative. I know the area of the dual 2.5" isn't as much as the single 4" but wasn't sure if 3" would be overkill.
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Old 10-10-2018, 04:59 PM
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I have a 3” downpipe split into dual 2.5”. Runs good to me.






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Old 10-12-2018, 07:16 AM
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I ran my 4" underneath, then split it into 2-2.5" duals, both have mufflers.
Surprised in a truck you cant run one 4" all the way back, I did it on a 65
Buick, 2 mufflers, over the rear to the rear bumper.
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Old 10-12-2018, 07:56 AM
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What are those horns coming off the pipes after the muffler? For drone?
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