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Chevy Silverado and GMC Sierra Exhaust System Questions

37 messages,  Last post on Oct 13, 2009 at 11:32 AM

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What is this discussion about? Chevrolet Silverado 1500, GMC Sierra 1500, Chevrolet Silverado 2500, GMC Sierra 2500, Chevrolet Silverado 3500, GMC Sierra 3500, Exhaust, Truck

#24 of 37 2008 duramax LLM exhaust by hack5666 Jan 26, 2009 (6:07 pm)
I have a 2008 GMC Duramax 6.6 LLM and I want to do something with my exhaust and was wondering what would happen if I were to cut out my cat and straight pipe it from the turbo back. I have recieved several different answers when I ask what it will do to my truck. I am not worried about the warranty, unless it will cause damage, anyone that can give me a straight answer will be greatly appreciated, also if it wont hurt my truck, how much louder will it make it. Thanks Replies to this message: akjbmw (Jul 01, 2009 12:37 am)
#25 of 37 RE: Exhaust manifold bolts [klobear] by manombo Jun 29, 2009 (8:40 am)
Replying to: klobear (Jun 01, 2008 3:42 pm) I have the same problem with my 2002 Silverado 1500. I developed an exhaust leak on the driver side and when I looked to check it out, I thought the back two bolts had fallen out. I went to the dealer to get replacements, but the were out of stock (which I thought was odd). When the special order came in they were different. The new ones had a larger head. Now the bad part... When I attempted to install the new bolts I found the old bolts had actually broken off in the head. Before I tear my cylinder head off the truck, does anyone know if there has been a recall on these?
#26 of 37 Re: 2008 duramax LLM exhaust [hack5666] by akjbmw Jul 01, 2009 (12:37 am)
Replying to: hack5666 (Jan 26, 2009 6:07 pm) Do some checking on what your local requirements for smog checks are/will be. I understand that there will be a smog check required here for my '07.5 LMM starting next year. The previous owner went to an aftermarket exhaust from the DPF back that wont affect the test. There are folks at the dieselplace.com site who have done and reported on multiple combinations of exhaust mods for the various Duramax generations. I am inclined to believe that it is an aesthetic thing 'cause I REALLY don't see ever reaching the break-even point on the ROI. I think it would be a LOT more miles than I will put on it. Even considering that I will be pulling a trailer most of them. Yes, I like the exhaust sound but would not consider spending for the conversion. Also, I have no idea what the original exhaust sounded like.
#27 of 37 y pipe? by olemissrebs Jul 01, 2009 (2:33 pm)
i have a 2002 chevy silverado. i already have dual exhausts on it. i have a muffler and a cat. im taking the muffler off and putting in a y pie. will doing that mess anything up with the truck. or will every thing stay the same but it will just be louder? Replies to this message: obyone (Jul 01, 2009 10:41 pm)
#28 of 37 Re: y pipe? [olemissrebs] by obyone Jul 01, 2009 (10:41 pm)
Replying to: olemissrebs (Jul 01, 2009 2:33 pm) When you state dual exhausts I'm assuming true duals from the exhaust manifold to the tailpipe. Installing a Y pipe you're converting the dual setup to a dual in/ single out exhaust? If this is the case, it probably won't be louder and with more restriction you'll probably get better lowend.
#29 of 37 RE: Exhaust manifold bolts [klobear] by nolonger8 Jul 31, 2009 (2:13 pm)
Replying to: klobear (Jun 01, 2008 3:42 pm) I have a 2004 2500hd with 30000 miles. i have been fighting with gm for 2 years on this issue right after the 3 year warranty my driver side went, they did under good will, 2 months later my passanger side went they would not honor it. now a year later my driver side is bad again. Im getting now where< i dont like spending 1000 every 8 months or so on this, is ther a recall or is this just super poor product?
#30 of 37 gmc sierra exhaust by stunner293 Sep 08, 2009 (1:38 pm)
iv got a 01 sierra 4.8 293 it has a single in dual out flowmaster 40 series and turn downs sounds great at low rpms but not past 2 grand. wonderin what would really make it roar at low and higher rpms?? also thinkn bout runnin a y-pipe then 2 single-in single-out flowmaster super 40 series?? let me know what u think and or any other systems u think or know sounds jus badass. thanks Replies to this message: obyone (Sep 08, 2009 3:47 pm) stacks125 (Sep 08, 2009 4:23 pm)
#32 of 37 Re: gmc sierra exhaust [stunner293] by obyone Sep 08, 2009 (3:47 pm)
Replying to: stunner293 (Sep 08, 2009 1:38 pm) Cheapest would be to cut out the flowmaster and install a glass pack. Better yet skip the glass pack and weld a straight pipe in it's place.
#33 of 37 Re: gmc sierra exhaust [stunner293] by stacks125 Sep 08, 2009 (4:23 pm)
Replying to: stunner293 (Sep 08, 2009 1:38 pm) i have a 95 gmc with the 350 tbi motor, i have flowtech headers and then 2.5" pipe running all the way back with a h-pipe from flowmaster right after the headers and no cats with two super 44series and then it cuts out right after the rear axle to keep it hidden with no tips, its got a great low, high horsepower sound with no rasping at all and everyone that hears it seams to like it and yes it still is loud but sounds good

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