Give me a call or PM i can get you a set of ARH.

 

you cant go wrong with either set

 

KOOKS out pulled my LG's on the dyno slightly, but that equated to .05-.07 in FASTER ET in the 1/4 mile..

The BLUE LG pull was done in the morning, and the RED KOOKS pull was done about 4 hrs later after removal of the LG's & install of the KOOKS...

On subsequent runs compared to the last 3 yrs w/ the LG's, in comparable DA, I DID pick up .05-.07 ET with the KOOKS headers, with NO other changes.
None of the new KOOKS runs were EVER any slower than ANY of my LG runs.
They were always .05 or quicker ET..

 

I put ARH on my stock 02z and I drive my car on the track (Pacific Raceways). Well that is until I moved recently. The headers provided a real gain that you really noticed at the track. However, for some reason driving around town I had a vibration that I could not get rid of. The pipes would vibrate at certain frequencies at lower rpms that drove me nuts. There were two clearance points along the length of the headers where there was about 1/8" clear. That is not much and the only explaination I could find. Overall because of this experience I regret not getting the Pros. I now have another C5z that will get the pros. Then I will know for sure. FYI, the ARH are not "Bam" and their in either as advertised. And I have a lift too.

 

WOW, I had no idea there were any fitment issues for Corvette ARH . I thought they just slid in. Sorry to hear about the rattle, and very glad to hear you have decided to get LG Pros this time around.

 

The issue from what I could tell was the pipes get very close to the tranny and they do not have the mounting stubs that would bolt into the bottom of the tranny. The pipes also tend to be more to the passenger side inside the tunnel instead of centered. The vibration could be felt on the passenger floor well at the speeds and RPM's I mentioned. I was under there several times and came away convinced (though I never solved the problem) that it was the pipes being too close and I found the sweet spot were they would rub. This is a common issue with the f-body's that I got on a y-body. The headers were great except for this issue.

 

True but i just put a 2" whole saw on my drill and did it. No big deal and makes no noticable difference in the car with the hole there. I thought for $800 shipped it was a good deal. I do think that removing or moving the starter while you do it helps and disconnect the steering shaft(1 bolt) and they'll slide right in.

 

FWIW I ended up going with a set of Kooks 1 3/4" with 3x3" off road X.

 

That's kind of wild bro. You started this thread which header should I get, LG Pros, or ARH ??

Then you go with Kooks ?? Either way you did get a good set of headers. How was fitment, and how do you like them ?? Do you have before and after numbers overlayed so we can see where and how much power you picked up ?? Wish you'd have went with the LG Pros, but you can't go wrong with any of the top 3 brands IMO. LG Pros, Kooks, or ARH are all top notch.

 

I wouldn't put 1 7/8" on a stock displacement myself, but for pure 1/4 mile performance, they will have higher peak numbers and will perform a little better.

Obviously, on an ls6 headed, stock cammed setup they will sacrifice area under the curve and low end throttle response and street performance.

But the OP specifically stated he believed they would be better for top end and 1/4 mile, which has been the case for those who use them.

 

Congrats. I'm sure you'll be pleased.

 

I got a screaming deal on them from byunspeed...lets just say WAY less than anyone else I found.

I decided to go with Kooks because all the research I found seems to show them being the best for 1/4 mile performance.

I was going to go with LG's but I couldn't find any proof out there that they really were the best headers. So I decided to pocket the $500 difference.

Like you said they are all great quality, but for the price Kooks ended up making the most sense.

 

Well for 500 bucks I think you probably did the right thing. Did you retune the car and dyno after the install ?? Or are they not yet on the car ?? If they are on the car did you do the install and if so how was it (fit and etc) ???

 

I don't have them yet. I plan on paying for a dyno tune after I get them put on though.

 

Subscribed, waiting for results, good luck.

 

I know this is always debated on CF, but for the Vette, it really comes down to your heads.

In everything I've seen, your heads determine what sort of headers you need. Exhaust flow, exhaust valve size, and exhaust port size all contribute to what sort of header you need (moreso than a generic formula to determine primary length or size).

I'll say that AFR 205s really do work better with LGs, because the exhaust port is 85cc and has a large 1.60" exhaust valve. Remember, the TFS 235 has an 86cc port with 1.60" valves and its designed for 427cid. Either way, the LGs help get the flow up in the exhaust port, thus making a ton more power at 4k (but similar at 3.5k and 4.5k). This also happens with the LS7 and L92 heads (weak flow in a large port).

On TFS heads or ETP or any head that has a relatively small exhaust port with high flow numbers, the difference is moot between all of them. If anything, the shorter primary design can help evacuate the already quickly escaping exhaust moreso than very long primaries, thus making more power without really losing any torque.

Also, if you look at LG's website with all of their comparisons, you see the LG header making a big jump at 4k and the other headers looking relatively flat with a slight incline from 3k to 4.5k. I've never actually seen that on any dyno on LS1tech or CF for the other headers. They generally like to ramp up around there too (more of an intake manifold design restriction). I've also never seen that jump at 4k except on stock heads and AFR 205s for the LGs. On most independent dynos, the LG's ramp up very hard at 4.5k on head/cam cars (not just cam-only). But, so do Kooks and ARH (maybe not quite as hard), but the peak torque numbers are very close in that 500 RPM window from 4500-5000. Independent graphs show pretty much a very similar torque curve most of the time (such as YO-ELs).

So, there are cases where each header simply works better.

 

LG is having a sale for there headers for Corvette Forum members. $895 with free shipping for street style LT's and x pipe. The pro lontubes are 100 off the retail price. For that kind of price, I think its a no brainer.

 

if you get the lg streets, make sure you ask them for some good clamps, or else they'll continue using the worthless clamps like I got. Fitment isnt the greatest either. Wish I would of went with the lg pro's

 

I've got LG Pros. I love the sound of them with my Bullets.

 

Beginning install of Kooks 1 7/8 tonight with offroad x-pipe. I will post up how it goes. Stock engine but I got a nice deal on the setup so I will just have to add a big cam later to make it ok.