People state that the gains for the Z06 manifolds and exhaust x/h-pipe is netting 80% of what a full header set gets I will believe that when I see dyno proof. Changing the manifolds will not give anywhere near the results of a 32" or 27" primary that leads to a 3" x-pipe through highflow cats. 1500-1800 gets you 30hp+ and I doubt that you will get 5 with the Z06 manifolds.

The joke is someone believing that hype that was likely started by someone in the for sale section.

Post proof of this one before I will believe it.

Anyone have the truth on this? I would like to see some testing. Another guy just did this in the C6 tech sectionand claims it feels like 20rwhp. I'm not a believer. The reason why is that a Z06 that switches to LG headers such as seen here nets 30 over its stock exhaust.

Baseline-bottom line is with the Z06's stock manifolds and same car after with LG headers and CAI is 35 over the Z06 manifolds originally on the car.

 

There was someone who did dyno a gain of 20ish rwhp, his final numbers were in the low 370's. LG also says they are good for 10-15rwhp over the stock C6 manifolds.

Be nice to have more results but there does seem to be a nice gain.

But they will not get you the same gains a proper long tube header will, I would consider them if living in a state with strict inspection testing and needing to stay with oem parts.

 

What does that have to do with placing FULL Z06 exhaust on on a LS2??? I have no trouble believing 15-20HP is possible.

 

So, you trash or make fun of something before knowing the answer? State outright that it is impossible and demand/order proof? Must be hard to get the old head through doorways.

 

Yep, that and "warranty" issues just may be circumvented by staying with OEM stuff...

 

I debated with myself about this for about 6 months and said screw it, just put the headers on and move on...

 

I found the claims of 30+ HP gains from doing the swap a little far fetched as well but I think there are dyno #'s on here somewhere showing that on at least one car it was pretty much true.

 

Dyno results have been posted. Try using the search function.

The manifolds aren't "the best" and the "most powerful". But they're way, WAY better than the LS2 manifolds, with their individual runners, much larger collector, larger cats, and stream lined design (as opposed to the LS2 which merges exhaust at a 90* angle!).

Yes, like most mods on most cars, there are alternatives to the forum-popular, overpriced "boutique" headers.

 

Glad see that I am not the only one that wonders why Corvette headers cost so much.

 

I'll defend Spin. I have to admit I feel the same way he does. It just seems too good to be true. One of the reason you get such a good low end torque gain with long tube headers is the long length of the primary tubes and the scavenging effects of the merge collector. I would believe 15 rwhp, but not 30.

 

with Glenn! I will defend spin to, and 1 point is if you took the zo6 manifolds and exhaust mass air air intake dry sump you would have as much net hp as the zo6, so i guess the bigger cube motor means nothing

 

You'd get MUCH better performance with a set of LG Street series headers, which seems to be around the same price as the Z06 take off systems. About the only time I can see it being worthwhile is if you got the sytem for free or next to nothing and you were going to install it yourself.....but to each his own.

I will say this though...take two bone stock C6's - on one change the pipes over to Z06 from the heads back, take another, add a set of headers and keep the stock mufflers....tune both...the Header car is going to beat the Z06 piped car everytime in every area.

I do agree with one aspect of this idea - and that is there is a huge Corvette Tax on headers. $1800 +/- plus install is a heck of a lot of money compared to prices of other cars....some resign themselves to it comes with the territory of owning a Corvette, others don't have as much money to throw around, ESPECIALLY in our current time of recession. I do applaud anyone doing the best with what they have available, and recycling unwanted Z06 parts if that's what they can afford or desire...as long as they aren't led to believe something that is not true that is propegated by the seller in the "For Sale" section looking to make buck at someone else's expense.

The theory of "it's oem to pass warranty or inspection" does not hold up however, as you still removed the stock factory installed system or part and replaced it. As a licensed NY Inspection Station, I can fail a car for any emissions related change that was not done by a dealer with a certified replacement part that is EXACTLY the same as the one built on the original car by the factory. I don't do business like that, but some shops and dealers do.

 

I don't think anyone is claiming equal gains to LTs. I believe someone estimated 80%. I think that might be a little generous but there has been at least 1 car making 30 more rwhp with just the Z manifold swap. More tests need to be done on other cars to make it undisputable. I think 15+/- rwhp is an accurate guestimate as to the average gains. No doubt LTs will give you more/better power but for those wanting to really stay within a budget and have warranty/smog issues to deal with. Z manifolds seem like an acceptable alternative. I would like to see more proof though.

 

http://www.lgmotorsports.com/catalog...oducts_id=1698
$1195.00

No way in hell I'd pay $1195.00 for a complete Z06 exhaust system.

 

Please be sure to highlight where I BASHED the Z06 manifolds or mader fun of them. I called it out and provided a reason I think it may not be true. I said I didnt beleive it, gave my reasons, and asked for proof. Sorry if the mod of the day gets called once in a while. I also dont believe the claim of Corsa that states their exhaust nets 14hp on my car. Zero was seen by most tuners. I have LG headers and 3" pipes going to 3" Z06 cat back. I dont feel a thing from the exhaust. I know forum member that got 2hp at peak using the Z06 exhaust with 3" pipes all the way back. I have some of the parts involved in the debate here.

LG headers on my car: 30HP. Lg headers on a Z06....30hp. If the headers made 15hp on the Z06 I could see it. If the LG's made 50hp on a 6 liter C6, I could see it but if going from the Z06 manifolds to headers gets the same amount on my car as a Z06 something doesnt add up. I csan provide about 20 more dyno sheets from Z06's netting the exact same amount of power as a 6 liter C6. They are all over the LG site.

Now if the guy that did the swap got 15-20 with a tune then it makes sense. If he got 370rwhp without a tune then I will be the first guy to recommend the mod to someone on a budget. Until then, dont be offended when someone doesnt want to drink the cool-aid.

 

I did and didnt find it What I did find was you stating the manifolds give you 80% of the gains of headers so why dont you post the proof instead of telling me to find it. It was your statement.

YOUR statement to that guy on anther thread was that they give you 80% of the performance of headers:


If that was true then the gains of the LG headers should be 20% of what they did on my car since the Z06 already started with 80% of the performance of the headers right? So I got 30HP and the Z06 manifolds give you 80% of that so the addition of the same headers on a Z06 should net only 6HP since it has 80% of the headers gains before they were put on.

I'l wait for the proof and if it comes by way of a guy posting that he got 20hp wiht a tune, I think this one will head south. Now if some people post real results, I'll be the first to back up the mod.

Please believe me when i say I'm not picking on yu but rather trying to find if this is a big exaggeration. I dont like unbelievable claims made without backing them up. No offense and I hope you know I'm sincere. My only motivation is the truth. I've been wrong before and i admit it when i am wrong. I have also been right and saved some people from silly BS.

Was it this guy:

Looks to be nada fro the Z06 parts there since stock is 355-360. 29 from the mods with a tune would be 379 if the baseline was 350, which would be a bit low.

haltech:5
intake/TB porting:10-12
tune:12

 

And no way you will get anywhere near the gains of that system. Cars with headers like mine are gaining 30+ rwhp and 40+rwtq. What are you proving? For less money you get less power? Dont pay it who cares but the cost of such mod parts is a personal decsion. I get what I want and have documented gains. You get the Z06 manifolds and document the claim of 80% of the gains for the system you wont pay for.

 

15 with a tune....yes. Headers have topped 30hp/40+TQ with a tune. Also, the gains of headers are also going to pay dividends when you add more mods that increase the required airflow for the exhaust. The Z06 manifolds will eventually be a restriction. This is why cuttout s net nothing on cars with less than 410rwhp and they get you 5.5 on cars that are cammed with near 440rwhp. Its also why a Z06 wth headers gains near 35rwhp and 42rwtq gains over its manifolds that they replace.

 

LG states the 10-15 was with the cat back (mufflers) too. That exhaust is one of the only ones that does make a difference. It wasnt just the manifolds or the pipes replaced by the headers. I dont consider the catback to be part of the header system since I had to buy them separately.

I think at this point we are basically looking at some peope that are pissed at the corvette tax and were a bit excited about the potential gains. The gains arent 80% of a header system and a Z06 catback alone isnt going for 300 bucks let alone with the manifolds and cats. The average selling price for the Z06 catback is 400-600 on its own. Dyno tests showed exactly 2hp at peak and good Tq in the midband. I have the mufflers in addition to my headers. The Z06 mufflers and the LG headers on my car are not going to be only 20% better than Z06 manifolds and the Z06 cat-back.

 

The huge differance here come's when the inspection is done and they take a look at the cats. The Z06 system looks OEM, while a long tube header/cats is an easy giveaway. You could do this test at 100 inspection stations and unless they were extremely familiar with the Corvette (as you are) none of them would pick up on that it wasn't factory stock, imho.

So what happens later this year when MA does my inspection? I'll pray they overlook I have headers or think ARH's are stock....but if I get nabbed and fail, I'll have to throw on either stock LS2 headers (garbage) or go with Z06 manifolds/cats and try it again. One thing is for certain, if I do fail with the ARH, I'm done buying/using LT's and will be looking for something more stealthy that is better then stock....Z06 manifolds/cats fit that bill.

And just be be clear, I wouldn't see near the gains I got with ARH's but I'll take 10-15rwhp over the stock iron cast crap.