Is this exhaust stock?
Thread Starter
Staging Lane
Joined: Dec 2005
Posts: 71
Likes: 0
From: Portland OR
A simple question: Is the exhaust stock? Hi. I am new to the LS1 and the forums here, but not new to automechanics in most aspects (despite being a 20 year old!). I do have a newbie question thats been bugging me since I bought my LS1.
How can you tell if the exhaust is stock?
I peeked under the car a few days ago and didn't notice any brand names or markings on the muffler. The Y-pipe looks stock for sure, and I didn't get a good look at the intermediate pipe, but I'm assuming its stock too. However, the car doesn't have the Square tips that (I thought) ALL factory Z28 exhaust systems come with. There are 2 round tips that stop a few inches short of the rear bumper. However, a previous owner might have cut them off if he felt there were unsightly.
Any specific things for me to look for in identifying the factory exhaust? Measure the pipe at the end and compare? GM markings to look for? Production line give-aways?
The car is a white 1998 A4 Z28 with 85k miles, if that makes a difference. From what i can tell, everything else on it is stock, but I bought it from a dealership and don't know the history of the car.
Thanks for the help! The z28 is by far the most exciting thing I've ever driven!!!
How can you tell if the exhaust is stock?
I peeked under the car a few days ago and didn't notice any brand names or markings on the muffler. The Y-pipe looks stock for sure, and I didn't get a good look at the intermediate pipe, but I'm assuming its stock too. However, the car doesn't have the Square tips that (I thought) ALL factory Z28 exhaust systems come with. There are 2 round tips that stop a few inches short of the rear bumper. However, a previous owner might have cut them off if he felt there were unsightly.
Any specific things for me to look for in identifying the factory exhaust? Measure the pipe at the end and compare? GM markings to look for? Production line give-aways?
The car is a white 1998 A4 Z28 with 85k miles, if that makes a difference. From what i can tell, everything else on it is stock, but I bought it from a dealership and don't know the history of the car.
Thanks for the help! The z28 is by far the most exciting thing I've ever driven!!!
TECH Senior Member
Joined: Apr 2004
Posts: 6,157
Likes: 1
From: Texas
My SS had round pipes.
Take some pictures and post em up
www.photobucket.com will host them for you.
Take some pictures and post em up
www.photobucket.com will host them for you.
Joined: Nov 2001
Posts: 34,629
Likes: 2,548
From: Schiller Park, ILL Member: #317
Check the muffler for the following part number:
GM
10414653
That should be embossed on the bottom of the muffler (facing the ground). That's the part number for an LS1 Z28 muffler.
Hope that helps.
GM
10414653
That should be embossed on the bottom of the muffler (facing the ground). That's the part number for an LS1 Z28 muffler.
Hope that helps.
Thread Starter
Staging Lane
Joined: Dec 2005
Posts: 71
Likes: 0
From: Portland OR
Finally got some pics taken Okay. I had to wait for the weather to die down before I could take pictures. I posted them up on a Geocities site I had. There's a video clip on the 2nd page to give a feel for how it sounds. To me, it doesn't sound much different from the stock clips on LS1sounds. However, you guys are more knowledgeable than me on these cars. It happens to be the first LS1 that I've ever been around.
The links are
http://www.geocities.com/jeremy_welb...o_exhuast.html
http://www.geocities.com/jeremy_welb..._exhuast2.html
Again, its a non-SS 1998 Z28. Let me know what you guys think.
Thanks again for the help
Jeremy
The links are
http://www.geocities.com/jeremy_welb...o_exhuast.html
http://www.geocities.com/jeremy_welb..._exhuast2.html
Again, its a non-SS 1998 Z28. Let me know what you guys think.
Thanks again for the help
Jeremy
Thread Starter
Staging Lane
Joined: Dec 2005
Posts: 71
Likes: 0
From: Portland OR
Not stock...what I was thinking. But comparing to the LS1sounds, it sure doesn't sound like a flowmaster.
My old 302 Mustang had dual exhaust with flowmasters. The sound of this thing doesn't compare at all. The deep rumble and part throttle drone just aren't there. But I'm not expert anyways.
any other suggestions? Does that I Pipe look stock?
My old 302 Mustang had dual exhaust with flowmasters. The sound of this thing doesn't compare at all. The deep rumble and part throttle drone just aren't there. But I'm not expert anyways.
any other suggestions? Does that I Pipe look stock?
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Joined: Nov 2001
Posts: 34,629
Likes: 2,548
From: Schiller Park, ILL Member: #317
Yep, looks like a Flowmaster. Lots of people just weld in a muffer rather that doing a whole catback.
A stock LS1 with a single Flowmaster crossflow sounds nothing like a 302ci mustang with a dual flowmaster system.
A stock LS1 with a single Flowmaster crossflow sounds nothing like a 302ci mustang with a dual flowmaster system.
Originally Posted by ZeeVert
Is it common to weld-in after-market exhausts? Seems like you'd have to drop the axle to do a decent job.
As for the thread, thats definatly a flow master, your mustang would sound totally different because 1, totally different car, you had duals, and 2 the flow that fits to an fbody is an 80 series not a 40 so it will sound different, ls1sounds will also sound different dpending on car, age of the muffler, and your speakers
Thread Starter
Staging Lane
Joined: Dec 2005
Posts: 71
Likes: 0
From: Portland OR
Understood.
Its a flowmaster. So that means whenever I get the money to do exhaust, I'll make sure to replace it with something with a little more flow.
Thanks for your help.
-Jeremy
Its a flowmaster. So that means whenever I get the money to do exhaust, I'll make sure to replace it with something with a little more flow.
Thanks for your help.
-Jeremy
Originally Posted by jswelburn
Understood.
Its a flowmaster. So that means whenever I get the money to do exhaust, I'll make sure to replace it with something with a little more flow.
Thanks for your help.
-Jeremy
Its a flowmaster. So that means whenever I get the money to do exhaust, I'll make sure to replace it with something with a little more flow.
Thanks for your help.
-Jeremy
