is there a difference in sound?

i hear a difference but it dosent sound performance?

 

i need help this is my story: i traded my stereo for a header, i was told it is a performance header from GM, got it installed, the mechanic mentioned that it looked to be the same he even mesured the size of the holes, now im ok with having a stock header since mine was cracked but now im hearing a buzzing sound. now if this was a GMPP would i hear something different or it would be the same? i brought it back and the mechanic was like thats not an exhaust leak. please help i feel i got fucked in the ass by both parties

 

Its only a slightly ported stock header, so not really.

 

Like I mentioned in your last thread, and what Pyros just said....

You wont notice much of a sound change from it.

Back in the day when I had the GMPP manifold my car felt a little more peppy is all.

 

ok so the sound i am hearing is def not performance and its sounds like ass. and if it was a performance header the no name mechanic would of thought is the same one?

i didnt really test out the new install yet where did you notice the gains? i didnt really feel anything different just driving down the road i havent gotten on the highway yet

 

pretty interested in hearing what other ppl say about this, i would think that the sound would be a little different. and notice at least a very small difference in perf.
but i wouldnt know, dont have one :/

 

It felt a little stronger in the mid range at WOT when I had it.

Again, someone dyno tested it, and it produced about 4whp and 6wtq. Nothing crazy.

 

A header does not change the sound much on these cars (unless you install the JBP noodle).

The tone may get slightly deeper, but it is hardly noticeable.

When I removed my GMPP header and installed a Badmab shorty I didn't notice much of a sound change, but I def felt a decent bump in power in the mid - upper rpms.

 

if i remove the heat sheild should i be able to see a part number im just totally bumed out because im not sure what i have and that sound i cant tell if its supposed to be that way, its only on WOT i hear it

 

oh ok cool, i get it.
i learn so much from these forums, so when i get my balt ill know somewhat of what im doing to it.
and i said that the sound difference cuz my si, you def hear a difference. but dont feel anything unless tuned.
good info though man!

 

No prob man.

Glad you are finding things helpful.

 

Below is a pic of my old GMPP manifold. I thought I had a better pic with the part number visible, but I can't seem to find it. Notice the smooth collector area. Did you look at yours before you had it installed?



But to answer your question....

Yes, if you remove the heat shield you will be able to read the part number.

 

Still not the best, but at least you will know where to look for the part number.

 

whats the collector area? he showed me my old one this morning and noticed on the left intake was all weird and not just a simple tube entrance the performance one would have it closed off? (in your picture the left tube on top notice where there is somekind of outline)

 

I believe the part number stamped into the manifolds are exactly the same. It is very difficult to tell the difference between the GMPP and the stock exhaust manifold.

If someone is looking for a GMPP exhaust manifold they are better off taking a dremal to their stocker. My ported stock manifold is opened up more then my old GMPP manifold.

 

I could have sworn the part numbers were different when I had my manifolds side by side.

It's been a long time since I've seen either one, so I can't say for sure.

 

The collector area is where all the primaries (tubes) attach, and collect the spent exhaust gases.

The first photo I posted shows the outlet of the collector. It shows how smooth the inside of it is. The stock manifold is rough and has casting imperfections.

 

You might be right. I bought a "GMPP" manifold a few years ago. When it arrived, it had the same part number as the stocker and had been dremeled. I contacted the seller and he swore up and down that it was a GMPP manifold that he had dremeled to "opened up" the flow a little more. I think he was full of it! lol

The description states.

"19131972 Cobalt Extruded Honed Exhaust Manifold
We've taken the production LSJ exhaust manifold and had it Extrude Honed. The result - larger, smoother paths and a 7% airflow improvement for more power. Combine it with the Cat-Back Exhaust (sold separately) to provide the ultimate performance exhaust for your vehicle. "

So I do not think they manufacturer a new manifold where a different part number would be cast.

 

ok so for sure the stupid sound i hear is an exhaust leak the mechanic is full of it. i put my hand next to it and i feel wind. as for comparing the two manifold well ill have make with that. anyway mine had a crack so either way its better not to have a crack. but the exhaust leak pisses me off, and he can oly fix it next week.

 

Fix it yourself!

I bet it is only a loose bolt or two.

You need to re tighten bolts on exhaust systems after a few heat cycles anyways.

 

i'd go badmab. cheaper, more gains, and u actually can hear a LITTLE difference. unless your going for the oem look for a warranty or something

 

He isnt looking for which header to purchase.

He is asking about his GMPP manifold he already installed.

I have the Badmab header on my car, and hardly heard any changes in my exhaust note by the way.

 

thanks alot Staged07SS you have been awesome im gonna try and tighten the bolts i can clearly see them. im not a complete noob when it comes to mechanics but exhaust stuff and transmission stuff well not my cup of tea, im pretty good at lowering cars and changing calipers and rotors and stuff like that and electronics a little bit. my next project is to change all the burnt bulbs in my dash and doorpanels.

 

No problem man.

Let me know if the leak goes away.

 

those bolts are not moving. im gonna have to wait till next week till he can take another look at it such BS