Uep

Matt09SLT · April 3, 2009

I was doing the first oil change on the truck... checking out the underside while the oil drains out. What are those two exhaust pieces between the cats and the muffler? Don't tell me this is more emissions equipment... I hate emissions equipment... crap that is not really needed but goes out as soon as the truck is out of warranty.

brims · April 3, 2009

The downstream O2 sensors? If that's what you're referring to, it's to check to make sure that the cats are actually working.

2000DV4.8 · April 3, 2009

Resonator? Be a little more descriptive...

Bostonsfavson · April 3, 2009

I'll wager that what you're talking about is the flex portion of the exhaust.

DanMan_S · April 3, 2009

The pipes? J/K

What year is the truck? Only the GMT900's have that flex section, correct?

Matt09SLT · April 3, 2009

09 sierra... I'll take a picture. A flex section would make sense for the second piece.

MikeInCtown · April 3, 2009

If it looks like a large diameter braided stainless hose then it's flex pipe.

09Jimmy · April 3, 2009

If you are talking about the big, ugly gallon paint can sized monstrosity ahead of the braided flex pipe, I believe it is a resonator. Because no one had listings for a 2009 cat-back I bought a 2008 cat-back. Well, it don't fit. $600 bucks down the toilet. That's okay, it goes along with the 2008 GMPP cold air intake I bought that also doesn't fit because they changed the MAF sensor location. It also goes along with the ARH longtube headers and catted Y-pipe I bought that don't fit because there is no flange anymore between the Y-pipe and catback, just that stupid flex pipe. Maybe I should sell my 2009 and buy a used 2008 so my mods will fit.

Matt09SLT · April 3, 2009

yeah, the paint can sized thingy (good description)... so I have a resonator and a flex pipe... sweet at least its not a third cat.

Jimmy, why wouldn't the headers, y, & cat back fit if you replaced everything together?

pennzoil29 · April 3, 2009

If you are talking about the big, ugly gallon paint can sized monstrosity ahead of the braided flex pipe, I believe it is a resonator. Because no one had listings for a 2009 cat-back I bought a 2008 cat-back. Well, it don't fit. $600 bucks down the toilet. That's okay, it goes along with the 2008 GMPP cold air intake I bought that also doesn't fit because they changed the MAF sensor location. It also goes along with the ARH longtube headers and catted Y-pipe I bought that don't fit because there is no flange anymore between the Y-pipe and catback, just that stupid flex pipe. Maybe I should sell my 2009 and buy a used 2008 so my mods will fit.

Sorry to hear all of your mods don't/won't fit, but damn, didn't you do any research?

09Jimmy · April 3, 2009

Hey Matt, you got it right. What I have to do is replace the exhaust front to back as a complete unit, not individually. I had planned on installing the catback first and then installing the headers once my engine is broken in.

I tried to do my research but no one had any info for 2009 model years yet. All the vendors said 2008 parts would fit. I ordered the exhaust and intake before my truck was delivered so I couldn't actually eyeball anything. GMPP's own listing says the CAI is for 2007-2009 GMT900 trucks. I took it back to the GM parts dept and we went out on the lot and popped the hood on a 2009. They confirmed it wouldn't fit and gave me my money back.

hossmp2500 · April 3, 2009

I had the same issue with the GMPP intake and they did credit that back. I am not sure why the exhaust wouldnt fit. The only reason I could see would be different size or lenght from the cat back. The resonator can be ditched. I have ditched them on cars before. I havent looked that carefuly. I did speak to Corsa and they said the exhausts fit so lets hope they arent like the GMPP website!

hossmp2500 · April 3, 2009

Just an FYI I looked at the CorsaPerformance website and they are listing systems specifically for the 2009 truck and they are now breaking the 07-08 out also. Its not a 07-09 listing. I assume this means you can get a system from them.