The way I read his post he has not dynoed the car since installing the Z06 parts.

I don't expect the same gains as LT but if you pick them up cheap it sounds like a very good idea.

 

I see an LG vs Kooks vs ARH vs Z manifolds thread coming

 

I have no idea why you keep ignoring my posts but maybe the third time is the charm? Look at the ls1tech link that was posted in the other thread. There is a dyno there.

Here is a link to it: http://www.ls1tech.com/forums/attach...6&d=1199325097

 

When I started down the exhaust upgrade path I did not have a specific HP increase in mind. I traded a cam and springs for a used LS7 Z06 exhasut system, excluding the mufflers. Because the Z06 NPP mufflers are pretty good, the Z06 guys tend to keep them. After looking at the various mufflers for the Z06 system I selected the Corsa Sports for the Z06 exhaust. I was worried about the dreaded A6 drone. With the LS7 Z06 exhaust system with the Corsa Z06 Sport mufflers you have a pure and complete 3 inch system front to back . I had my 2006 A6 dyno tuned to the same level, on the same dyno, by the same tuner, pre and post Z06 exhaust install. The tuner at NRP and I guessed that I would pick up about 20 HP and were somewhat surprised at the 30 RWHP . The K&N CAI car went from 343 to 373 RWHP. There were NO OTHER changes. The exhaust was designed for a high performance 7 liter engine. When you compare it to the exhaust of a 6 liter engine for the LS2, there should be no surprise that you pick up a bunch of power. There have been several Z06 drivers in the Corvette Club in Vegas that have put headers on their Z06's and only picked up a disappointing 10 RWHP or less. One of our club members added a cam first and then the headers. He only picked up 10 RWHP. I wish that I could post the dyno sheets but, being a junior member that is not possible. The numbers are real. I realize that sometimes BS gets put on these forums and should be viewed with a skeptical eye . But every once in a while there are some upgrades that work better than expected. I think GM built a superb factory exhaust system for the Z06. In fact they are using the same exhaust system on the new ZR1. That should tell you a little bit about it's capabilities. I do not think they would put a poor system on a $100,000 plus Corvette. One more point--Welcome back Spin.

 

A tuned set of headers-vs-gm manifolds, err, that's a no brainer.

I'm lovin my LG's

 

I'm surprised that no one's brought up the port shape differences/compatabilities between the LS2 heads/manifolds and the LS7 heads/manifolds, ya know the whole round/oval port versus 'D port' thing etc.

 

A couple points from the entire thread: 30 to 35 hp gain with LG headers ALONE on a Z06? No way. We tried them, tuned the whee out of them and gained 2 rwhp peak. The Z06 exhaust system is very good, it's basically a shortie header from GM. Now the LG's being long tubes did pick up 15 ft lbs of midrange torque over the stock system. The American Racing headers btw, with the bigger primaries, picked up 4 peak rwhp but only 13 ft lps of midrange torque. Both did just as expected. Anyone who changes the exhaust to longtubes on a Z06 and gets lots of additional peak power is changing something else at the same time, like adding a CAI, and claiming the total change is 20+ rwhp.

Also, from LS1Tech: http://www.ls1tech.com/forums/showthread.php?t=836608

He got 30 rwhp from changing to a Z06 exhaust system.

 

I have been following this thread for a while. Those dyno charts are taken over two months apart. The "stock" one it was 81 F ambient and the Z06 mod it was 63 F ambient. I am not sure this is a good comparison. Also as a point of reference Callaway (?) used to offer a set of shorty headers and they only claimed 12-15 hp improvement.

 

There is a correction factor of 1.03 verses 1.07 for the differences in temperature, humidity, and pressure altitude on the different days. This should allow for a good comparison.

 

Here is the dyno sheet

 

When you compare the dyno graph of pre and post Z06 exhaust runs you will notice a difference in numbers. 343/373 as mentioned in the above post and 338/365 as seen on the dyno graph that John posted. I did not keep the original 343 dyno tune sheet, so I asked Gil at NRP to make a dyno sheet that compared the pre and post dyno results. He wanted to make sure that there would be an apples to apples comparison. The smoothing function on the original 343 and 373 was 3. The above dyno comparison sheet is a 5; therefore, horsepower gain is only 27 RWHP not 30.

 

Corsa claims per their web site for the Corsa Sports for Z06 only:

Extra 10 horsepower and 14 lb./ft. of torque to the wheels
22% increase in flow over stock with valve open. (CORSA=840.5, STOCK=691.5)
171% increase in flow over stock with valve closed. (CORSA=840.5, STOCK=310.0)

They make no claims for the C6. Last time I read about your car here, it was a modified C6, but not a Z06. That is not to say that Corsa overstated it, but let us compare apples to apples.


100%. Luckily in my state they dont test a new car for 4 years after purchase giving you a free 4 year out of jail pass. Still, at that time I got the same worries as you.

 

No one made claims of great "low end tq" w/the Z06 mani's. Claims were peak hp, where the short tube lenght of the mani MAY actually benefit peak power.

 

I can't beleive you guys are defending a "guy" (who has done nothing but post an [subjective] opinion), when dyno results [objective] have already been posted.

 

My bet is that this debate will go on for a couple days. It will give me something fun to follow.

For the record, I bought headers, but I am sure that they are the wrong kind.

 

No one has claimed otherwise.

Really??? Show me where I can get LG's for $500 please. I'll buy thm the second you show me.

Damn right I'll do the install myself. Obviously, anyone who post about getting "80% of the gain for 30% of the cost", is a DIY'er. People who pay other people to work on their own cars aren't reading this thread...I would hope, because they can afford the "boutique" parts and pieces....and the labor to do the easy R&R's.

No one here claimed otherwise. And it should, for 3 times the price, PLUS LABOR!

Thanks you for conceding the obvious

I don't believe that this ever happened. Spin said that. I've never seen that posted in the "For sale" section. Not even w/Z06 parts. Though it MAY have been at some time, and if it was, that's lame.

I do agree w/teh part about warranty, and technically you are right about emissions. Fact is, no normal emission station would notice heat shielded, factory Z06 Manifolds on a C6.

 

Here it is for you:The C6 base lined with only a K&N CAI at 343 (1.06 corrected) rwhp on a Dynojet 248. After the Z06 exhaust change the C6 dynoed at 373 (1.05 corrected) rwhp on the same dyno. Both times the car was in the same state of tune with Las Vegas 91 octane gasoline

Now I think that car did better than most will, which is why I gave the LG's the benefit of 20% more PEAK HP (Note that I've not talking peak OR low RPM tq.




No. Different engines, sizes, and tune. Oh, and different header sizes too. What would LG Z06 headers do on a stock, LS2?

And my only motivation is truth too. AND not buying headers for $1500+ That's just retarded. You can get equal length, tuned long tubes for a C4 for $414. They're made of mandrel bent tubing, welded to a collector, and a flange...same as all the C6 crap that costs 3-4 times as much. If I can get 50% of the gain of LG's for 1/3 the price, I'll do it, and I'll be money (and power) ahead for it, because I can put the money saved to the next mod. The culmination of which will be MORE than JUST LG's alone.

 

I did this mod on my car, it picked up about 10rwhp and 10 rwtq on the dyno, no other mods. I put the manifolds, mid pipe, and h-pipe from the Z06, then reduced it down right after the midpipe, into magnaflow weld in mufflers. Previous, 366, after 376. I dont have the dynos in hand, if i can find them, ill post them. But, the good news on it all, i got it all for FREE, and spent $300 getting them installed and retuned. So, for $300 i got 10 rwhp. And the sound is fantastic with the magnaflows. I know I have spent plenty of money over the years for stuff that doesnt work, but this did make 10hp and sounds great.
Same dyno

The car ran 12.135 @ 114 on friday at the track on Drag Radials (crappy 1.82 60' time).

Daren

 

I went from LG headers and high flow cats with a Z06 borla touring cat-back (complete 3" system) to a stock Z06 manifold and exhaust system on my 06 A6 with a H/C package. The Borla and everything else but the headers went on my new Z (the headers for the Z are different). Anyhow, after retuning and another dyno run my A6 went from 458 RWHP to 420 RWHP. That's a loss of almost 40 horsepower over the LG header system. Maybe there are other variables at play here but in any case there was a big difference.

 

Its good for at least two days.

May as well throw this in there too to help stimulate the debate. Pics of stock LS7 manifolds and cats.



The above is from http://www.superchevy.com/technical/...bly/index.html

The following come from http://www.ihp.com/GTR/Engine/Ultima-GTR-LS7.html