Gmpp Exhaust System Has Arrived

Vortec-Z71 · December 1, 2008

GM Part# 17802152

I'm so excited. The box it came in is huge. I think the hardest part of installing this system is loosening all of the nuts on the stock exhaust system. I've never installed an exhaust system, but it did come with directions. Any tips from those who have installed exhaust systems before?

I'd like to see some pics of exhaust systems already installed especially views from underneath. I'll add more pics when I attempt the install over the weekend.

MS3DALE · December 2, 2008

Trust me,The hardest part is removing your old factory system.

Installing the new system should be easy!

ZZ327 · December 2, 2008

what does something like that cost?

97SierraGMC · December 2, 2008

you only need to remove 2 bolts.. the pipe that connects to the pipe coming from cats at the flange

everything else is held in by rubber exhaust hangers.. and what i do is spray them with soap water / wd40 to make them slide off easier and the easiest way to get them off is with your hands.. depending on what you want to do you can jack the back of the truck up (frame, like off the back part of the hitch) and you can sneak the old exhaust up over the axle if you want to save it.. or you cut just cut it in the middle with a hacksaw.

re-install is even easier since its all in sections so its not so heavy..

remember to buy a new gasket that goes between the flange where you bolt the new pipe to if it didnt come with one..

Vortec-Z71 · December 2, 2008

you only need to remove 2 bolts.. the pipe that connects to the pipe coming from cats at the flange

remember to buy a new gasket that goes between the flange where you bolt the new pipe to if it didnt come with one..

The kit did not come with a new gasket, so if someone could get me a part number that would be great.

Also, I need to remove a total of 4 bolts. There are two up front for the flange and two 21mm ones in the rear where the receiver bolts to the frame for two additional hangars.

97SierraGMC · December 3, 2008

yea... but the hitch bolts will come out easy..

the exhaust likes to rust / not be very forgiving to nuts and bolts..

MS3DALE · December 3, 2008

You don't need any gasket,There isn't any on the GMT800/GMT900 trucks....(There was on the GMT400 trucks)

And I'm trying to figure out what two bolts you mean in the rear? I've installed many systems on GMT800 trucks (Hell I've installed many systems on GMT400 trucks as well!!) And I don't remember removing any in the rear,unless you mean you have to remove two bolts to "add" hangers since your system is a "dual-rear" exit style system?

97SierraGMC · December 3, 2008

You don't need any gasket,There isn't any on the GMT800/GMT900 trucks....(There was on the GMT400 trucks)

And I'm trying to figure out what two bolts you mean in the rear? I've installed many systems on GMT800 trucks (Hell I've installed many systems on GMT400 trucks as well!!) And I don't remember removing any in the rear,unless you mean you have to remove two bolts to "add" hangers since your system is a "dual-rear" exit style system?

yea you must have to add hangers.. any exhaust ive put on there is usually only 2/3 bolts holding the flanges together..

Vortec-Z71 · December 3, 2008

what does something like that cost?

It goes for $630 from the dealer not including the tips. I got it brand new on Ebay for $400 shipped.

Vortec-Z71 · December 3, 2008

You don't need any gasket,There isn't any on the GMT800/GMT900 trucks....(There was on the GMT400 trucks)

And I'm trying to figure out what two bolts you mean in the rear? I've installed many systems on GMT800 trucks (Hell I've installed many systems on GMT400 trucks as well!!) And I don't remember removing any in the rear,unless you mean you have to remove two bolts to "add" hangers since your system is a "dual-rear" exit style system?

Yes. I have to use two bolts in the rear to add hangars. I hope they're nothing like the studs on the front flange. I'm just going to spray the hell out of them with some PB Blaster and hope they don't shear.

Vortec-Z71 · December 4, 2008

This is the rear nut/bolt that I'm talking about.

Vortec-Z71 · December 4, 2008

How hard are those rear bolts going to be to remove?

MS3DALE · December 4, 2008

Those don't look too bad,soak them down with WD40 or PB-Blaster.

Vortec-Z71 · December 5, 2008

Alright, so I was able to loosen the nuts on those rear bolts and it was surprisingly easy. Tomorrow is the day when I really start the install. I just have a few more questions. It appears that the stock exhaust is held in place by those two studs at the flange and just a few hangars. Are the straps on the muffler attached to the truck somehow? Are the hangars welded in place to the frame? How difficult is it to separate the rubber part of the hangars from the exhaust itself? Is the exhaust heavy, or can I remove it by myself? Lastly, is the new muffler from the GMPP system suppose to go in a specific direction, I've never done this before so it may be a stupid question to those more knowledgeable?

97SierraGMC · December 5, 2008

the straps on the muffler do not hold it up. they hold the muffler together.

the hangers are welded to the frame and your new exhaust will utilize those stock hangers.

the rubber boots come off easy with some wd40 you just pull the rubber around the stud and it will come off. only take it off the exhaust though you re-use those on your new system.

id say the whole system weighs 100 lbs Tops

you should be able to do it i do them all the time..