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Discussion Starter #1 (Edited)
Does anyone know if it would be possible to connect rear exhaust pipes back from the header sidepipe conection with some sort of cut out valve that would allow me to switch from side pipes to rear exhaust?

I love the look of my stock sidepipes but need a larger diameter exhaust for less restrictive air flow on the highway. I have been told that running sidepipes and rear pipes at the same time could cause some kind of vortex performance issues thus the question on a cut out valve.

Just so you know I recently installed a 572 cu in GM crate engine. 620 hp. My plan would be to have the rear pipes hidden so it would look like a sidepipe only set up.
 

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"Does anyone know if it would be possible to connect rear exhaust pipes back from the header sidepipe conection with some sort of cut out valve that would allow me to switch from side pipes to rear exhaust?

I love the look of my stock sidepipes but need a larger diameter exhaust for less restrictive air flow on the highway. I have been told that running sidepipes and rear pipes at the same time could because some kind of vortex performance issues thus the question on a cut out valve.

Just so you know I recently installed a 572 cu in GM crate engine. 620 hp. My plan would be to have the rear pipes hidden so it would look like a sidepipe only set up. "




if youve got the fabrication skills and a welder theres not much you can,t do to an exhaust, you can run a cut off valve or just split the exhaust so it feeds both exhaust systems if you want to, that vortex performance issue, is bogus if you do the work properly





http://forum.grumpysperformance.com/viewtopic.php?f=56&t=1166


http://forum.grumpysperformance.com/viewtopic.php?f=56&t=495


http://forum.grumpysperformance.com/viewtopic.php?f=56&t=1503
 

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Discussion Starter #3
Excellent response I thank you. I am leaning towards a cut off valve for the sidepipes and to have the rear pipes open continously. This would help quiet it down when needed.
 
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