Dual pipes with X pipe muffler

L31MaxExpress said:

Dual in cat body works very well too. In fact the magnaflow/bosal high flow cat for a L30 305 Vortec van is identical to a TBI truck where it bolts to the manifolds and uses a high flow dual inlet/single outlet cat...

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L31MaxExpress said:

Tri-Y headers into a Merge Y or X-pipe have worked best for me for torque.

FWIW my 1997 Express van 350 Vortec was dual 3" to the muffler from GM.

I have a 3.5L V6 with equal length, merge collector shorty headers, dual 2.5" pipes and a X after the high flow cats. It smokes the tires anywhere in 1st gear.

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White96k2500 said:

So would be fine to run 3” true duals on a 96 vortec ?

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b454rat said:

It might change the sound, maybe a touch louder. The 1/2 ton stuff got the smaller pipes, but the 3/4 and 1 ton stuff got the 3" pipes.

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toomanyhobbies said:

I just saw this one and I would not recommend the Magnaflow. I had that muffler and didn't like the tone or the volume on my 350 Vortec. I went with what I think is a stock muffler (2 in 2 out) for a 6.2 truck and i like it very much. It sounds like a '70's corvette to me.

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L31MaxExpress said:

Dual in cat body works very well too. In fact the magnaflow/bosal high flow cat for a L30 305 Vortec van is identical to a TBI truck where it bolts to the manifolds and uses a high flow dual inlet/single outlet cat. No need to use the restrictive TBI Y-pipe. Used this cat with BBK equal length shorty headers on a 383 V8 Astro van build a few years ago. Little Astro van was a very strong runner with a 3" single exhaust. Owner wanted it smog legal and mellow.

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