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Another Question On True Dual Exhaust.....

kdog55

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kdog55 Enthusiast

kdog55

Posted
Posted

Spurred on by a different post response, I have a nagging issue with my set-up. I have a 2005 Sierra 2500, 6L. For anyone not familiar they come stock with dual exhaust into 1 muffler with a dual in/dual out set-up into a short Y-pipe for a single tailpipe look.

I originally just took out the stock muffler and replaced it with a Flowmaster Big Block series and kept all the OEM piping. Well the Flowmaster rotted away in a few years, so I just replaced it with a MBRP cat-back true dual stainless side exit kit. (Excellent kit, by the way!) What I am getting at is I thought I would get used to this, but after 3 months it still nags me, is that I was so used to hearing all the exhaust note from 1 pipe, that now that I have the duals I really only hear the 1 bank on the drivers side, and that makes it sound like the motor has a miss in it from the cab. I know it doesn't, but I just can't get used to it! So my question is, I wonder if an X-pipe or Y-pipe would help with this issue? Maybe I need to spend more money and fab up some tailpipes that exit out the rear instead of just behind the rear tires? MBRP only offered the side exit. Or is this just an inherent issue with these 6L's since I did hear good sounding exhaust is tricky to find with them.

Anyone else with side exit duals run in to this?

Thurman Enthusiast

Thurman

Posted
Posted

I can't speak for "modern" vehicles equipped with cats, dual-in an dual-out exhaust systems. These were after my learning curve with auto exhaust. I am experienced with older, carb and limited F.I. engines, that have dual exhaust equipped with various mufflers, some you've probably never heard of. I do know this: every older car, whether equipped with a stock engine or one that barely runs at idle then tunes out at 2500-5000 RPM, have been shown to run and perform better with either an "X" pipe or "H" pipe. My training on determining the use of one was to take physical measurements of the exhaust piping at the first bend in the actual exhaust pipe. It seems that IF there was a significant amount ( 61 yr. old brain fart on degrees) of temp rise in that bend--then another pipe was warranted. Most of the time transmission clearance and frame design dictated whether an "X" or "H" pipe. There have been studies done years back to prove that either pipe will improve exhaust flow which leads to better performance. I have personally witnessed the difference in "balanced" sound after the addition of these pipes. A friend of mine owns/hands on operates an exhaust shop and encourages this additional pipe when doing a change-over from single to duals on any vehicle. I have not seen any new, say five years or less, trucks in for this. The use of a "crossover" pipe will be determined by you and a good locally owned exhaust shop. David

dewfpo Senior Enthusiast

dewfpo

Posted
Posted

I had true duals on a vehicle once and didn't like the sound so I had them weld in a connector (essentially making and "H") and I liked the sound much better. It might have been my imagination but it also seemed a little stronger on the low end as well.

 

DEWFPO

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