I have a 07 mN and i Am going to be installing some LG pros with x pipe and cats.Is there anything i can do to make this job easy any tricks or hints i should know about? Should i change the spark plugs and wires if so what kind. I only have 12000 miles on the car.I will not be able to get a tune yet as local gm dealer told me the warranty will be void but headers are ok. I know i should get a tune but will wait a little while longer so will it be safe to drive the car hard for a while untill i do?and will the car throw check engine lite or not?I do not know of any good tuners in the area.Is a tunnel plate realy worth doing or can it be done later with out taking things apart?

THanks

 

Do a search on header install and you will find a wealth of information.
Header install on a C6 is quite easy and should only take a couple of hours.
Some tips we have learned: Spray liquid wrench on all the clamp bolts before you start. Buy a 13mm racheting wrench from Sears. It is a real time saver for removing the cast iron manifolds. Make sure you have a deep 7/8" O2 sensor socket as they are recessed into the manifold. Also make sure you have the O2 sensor wire extensions before you start.
This is a great time to change the spark plugs if the car needs it, but I doubt it does. I would not bother with the wires.

The car may set a catalytic convertor code. It will run fine and will not hurt anything, but it may set a code and light the check engine light.

Your engine control system uses two O2 sensors per side, one in front and one behind the catalytic converter. The rear one is monitored to determine the health of the cat. When the cat comes up to temp and lights off, it burns everything left in the exhaust and the rear O2 output is flat. The stock location places the cats up next to the engine. Your long tubes place them further down under the tunnel. Thus it takes longer for them to come up to temp and may occasionally set a code. This can easily be locked out by a tuner and then returned to stock if you need to.

 

As previous post mentioned lube all nuts and bolts prior to starting so things come apart easily. Also as stated no need for wires or plugs but you should remove them so as not to damage anything. Tunnel plate would be good to upgrade but not absolutely needed. You can do this later w/out a lot of hassle. Make sure you have a 1-1.5" hole saw to cut holes in tunnel plate for routing rear O2 sensors above tunnel plate. I put over 400 miles on my LS3 before I got it tuned and never threw any codes. A tune made a definite difference in the way the thing ran though. What a difference a set of LG long tubes made with a good tune.
I'm not sure if it's the closest but Tom Wong in Vancouver Washington does very good work when it comes to Corvettes. He uses a newly recalibrated Mustang dyno and is well versed in dyno tuning your Vette.

 

Great advice on all fronts.

You should be fine!

 

Tom Wong would be closest to me about 4-5 hrs. I will be storing the car away soon for the winter, so i will make the trip to him in the spring.I did see that LG sells a tunnel plate with the holes cut in.Are the ngk-tr55 were a better plugs than the stock ones or is it a waste of money?

 

I just did headers catted x pipe and cat backs last night.. you need a jack u trust your life with and 4 jack stands.. I never left the car on jack stands only and left the jack under the car too as a safety..

It took about 8 hours but might of been more like 6 hours if the borla exhaust i bought wasnt 2 inches too long and i had to cut off an inch from each side of one of the sections of pipe

tear everything out first.. Then go from the front to the back and leave everything just snug so u can work it around and position it perfectly with clearence everywhere

i put my headers in from the bottom.. dont worry its easy with good jack stands but remember to do the wire extentions for both the front and back O2 sensors first. also install the O2 sensors before u put the headers and the x pipe in (I forgot and then had to scrape my hands up doing it afterwards)

and the right tools will save your ***.. flex head ratchet and ratcheting wrenches.. also deep sockets help if you have them

 

If you're used to wrenching, you won't find this difficult at all. My only recommendation is to test fit everything first. I found I could not get the pipes to slip into each other no matter how hard I tried, although mine were coated so that may have contributed. If I had run into that difficulty under the car I would have been pissed. Instead I had time to take it all to a muffler shop and in a few minutes (and at no charge) they put them on their spreader and everything went smooth. If you can't do that I would at least pick up a spreader to have handy.







I also picked up some nice little clamps to help secure the O2 wires away from the pipes:





Also a great time to swap tunnel plates if you're inclined. I did because I wanted to stiffen the suspension a tad and help cut down the tunnel heat. The jury is still out with me as to how effective they are but, what the heck.

I'm bored so I'll add a sound clip of my LS2 w/ the same LG Pro's, high flow cats and Corsa Sports:

 

Sweet vette and nice install,thank guys for the tips.

 

I typically recommend the NGK TR6 plugs for performance use, they are one heat range cooler and will be fine to run.

 

What is the header bolts tq.specs?

 

And what header gasket is best to use?

 

Yo. I just did this install. It's an easy install, but now I have a nasty rattle/vibration. I think it's the O2 extension harnesses rattling against the tunnel plate. Also, mine leaks. I'm getting some Torctite preformed band clamps to hopefully resolve that problem.

There is an extremely high chance that your rear O2 sensors will throw "inefficient cat" codes, which does trigger the check engine light. Mine did, and though it may just be mental, it feel like my car is in limp mode. I checked with a scanner to make sure those are the only codes thrown.

I've read conflicting info on the forum. One thread says 18 ft-lbs, another thread says 22-25 ft-lbs.
http://forums.corvetteforum.com/1559144508-post2.html
http://forums.corvetteforum.com/1552430013-post12.html

A lot of people reuse the stock gasket without issue.

 

Question, Are the LG Pro's worth the extra money vs the LG Street series?

Thanks

 

Completely depends on the use of the car. If you are looking to just do some bolt on modifications and call it a day. Pick up the Street's and keep a little more in your pocket for other modifications.

If you are planning on doing a bit more engine work, or forced induction the larger mid section and better collector on the Pro's is going to shine more here.

 

Re-use your stock ones..

 

Thanks Anthony.. The only other options that I an considering at this time is a VaraRam Intake, Chuck CoW Tune for engine and A6 tranny, LG Headers & Hi Flow cats. Down the road I would like to add a cam like your G6X3. Love the sound!!

Thanks

 

Good Deal! Call me when you're ready.....We're still doing the Christmas tune special thru the end of the month....

Don't miss out!
Chuck CoW