View Full Version : chevy 6.0 dual exhaust
01-07-2012, 01:27 PM
I own a chev silverado 2500 6.0 4x4....recently i added a cat back dual exhaust system with cherrybomb glass packs and dual tail pipes at factory location behind pass side tire. now I have now power below 1800 RPMs, just wants to bog down. I put 200 miles on it to see if the computer would compansate for the upgrade...Ive dropped 2 miles a gallon...
01-10-2012, 11:41 AM
did you go dual 3 inch on the pipes? if so probably too big.
01-10-2012, 02:39 PM
Went with 2.5 inch pipe from the cats back...the pipes before the cats are 3 inch. since my post ive plugged one tail pipie and my power is back...I only have 90 miles on it... Will repost at my 200 mile mileage check
01-15-2012, 08:29 AM
What model year is you truck? If you have true, independent dual pipes, puzzled how you can "plug" one tail pipe unless you have a Y or H pipe-style crossover. Please explain.
01-15-2012, 09:35 AM
Originally was true dual...the power loss was so bad i couldnt tow a small trailer....We installed an H pipe and that is the way we drove it for the two hundred miles...the power loss was still bad...then i plugged off one pipe...We just put another 200 miles on it and still at 12MPG....difference is we were towing a tandem axle 6 x10 bobcat trailer half the time....guess we need to put some more miles on without the trailer.
01-16-2012, 10:29 PM
Get rid of the packs.. mine ran better with with magnaflows. Maybe you have. PLugged cat?
01-17-2012, 04:49 AM
No plugged cat that I can see...a local shop told me "not enough back pressure or MAF sensor" What do you guys think...Also If I go to Magnaflows should I use two singles or one dual in/dual out?
01-17-2012, 05:31 AM
My tragically stock LQ4 has a dual 3" exhaust with no crossover (except the muffler, which is DI/DO) I ended up just cutting up the stock exhaust on my 2500HD, so that's what i ended up with.
If you are having troubles, have the exhaust built into a single system at a local muffler shop.
01-17-2012, 06:22 PM
..We installed an H pipe and that is the way we drove it for the two hundred miles...the power loss was still bad...then i plugged off one pipe...
i would say that one of your mufflers is collapsed or came a part inside, and now your H pipe is working like a Y pipe, and the one muffler can't flow enough exhaust killing your power. i would pull the mufflers off and check them. or get 2 SI/SO Magnaflows and be done with it..if the muffler shop is telling you that you need back pressure to run right, find another shop...ASAP
01-19-2012, 07:14 PM
Something else is wrong...just not the fact you put dual exhaust on it. Despite what some people will claim on here you shouldn't have any noticable power loss by doing what you did. On my 2500HD 6.0L I cut off the stock muffler and put on dual 3" mufflers. Only difference is it sounds better, no change in fuel mileage and no change in power including when I'm pulling a 9,000 lb. trailer.
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