ok im looking into headers for my 02 WS6....

now my questions are...and there are quite a few so be patient with me...sorry if this is long also but it is important...specially since my b-day monday...family and frens hooking me up PHAT with cash

the best headers are Kooks QTP and FLP so ive seen and read...and they are "GROTT" headers or speeled something like that...what does that mean...i heard it sounds better than headers such as pacesetter or Hooker for some reason and do not kno why?

i will be running this with GMMG...and a catted Y-pipe....looking into FLP for both reasons....not sure which is the better buy? [whats your opinion?(money not the issue)]

would a High flow merge collector make a better sound like QTP has...or an aftermaret one such as the Borla XR1 merge collector? or would it be best to just use the stock collector?

since i have an 02...i do have the waranty still will LT's void the Warranty? would LT's cause me to fail emisssions? what about 02 sensors how should i go about that?

EGR provisions? whatever those are...why are they not on the 01 and 02 cars? whats this do....ive seen aslo that they jsut have the AIR provisions or something?

any info at all will be GREATLY APPRECIATED...thank you

adam

 

1. I don't know if the different brand of headers will have any affect on the sound. I haven't heard about that. I'm doubtful that is has any affect.

2. If you are going to run a catted ypipe and have no desire to run without cats then don't go with FLP. FLP has their system set up where you can run straight pipes in place of the catted ypipe area. It's a good system and if that's what you want to then that would be ideal. If you just want to run cats all the time then don't get FLP. If you decide to not run cats then just get an ORY-pipe.

3. The y-collector is not really for sound purposes but for performance purposes. A true y-collector like the flowmaster y collector that is on the QTP ypipe will flow better then just 2 pipes joined together like the stock ypipe was.

4. If you get the LTs then more then likely your warranty will be voided. LTs will cause you to fail emissions if they do a visual check, reason being is that you have relocated the location of the cats. If your area does not do visual inspections and you have cats i'm sure you would pass everything else.

You will have to keep the front O2 sensors as those are very important. Most aftermarket ypipes don't have provisions for the rear O2s. Either you can run O2 simms (which i have for sale) or just have the codes disabled. The rear O2s are only for the car to be told the cats are working properly. If you keep them on there and you keep your cats on when you do longtubes you still might get codes cuz of how far back the cats are from the engine. Also with LTs you will need O2 extensions for the front O2s. 24inch extension will work fine.

5. You have a 02 ls1. 01+ ls1's do not have EGR. They only have the AIR system. Once again you can either take out that system and disable the codes OR since you plan on keeping the cats then it might be better to keep the system in place. If you do that then you will have to buy the headers that have provisions for the AIR system. Race style headers have no provisions for any emissions systems on the ls1. Also if you keep the AIR sytem then you will need AIR restriction plates. You can either make them yourself or buy them. The AIR restrictor plates are there to prevent you from burning your check valves of the AIR system.

The AIR system is in place to help the cats heat up more quickly and help with the emissions of the car. Again this could be a problem with passing inspections depending on how strict your area is on that.

Hope this helps as i took forever to understand all of this stuff and to be able to go with my decision on what i wanted to do when i bought and installed my headers. Any more questions just let us know.

 

wow thats alotta **** haha...thanks alot that is pretty much what i needed to kno...anybody with any other info it is greatly appreciated but EXCELLENT WORK MAN!!!

in order to not throw any codes or whatever i would need the LS1 edit? or is it not necessary for LT install with cats...would it jsut be best to have a exhaust shop install it? would they do it best opr is there some other way to do it better...whats the best way for correct propper guaranteeds install quality? also if i went with FLP would running the ORY during racing cause the SES lgiht to show up?

will LT's be able to pass emissions wihtout the sniffer test?

 

LTs with cats will pass everything except for the visual check. Thats if they check.

You might get lucky and have no codes if you have rear O2 simms and keep the cats. I dunno i doubt it but i'm not for sure.

I installed my own with my uncle and cousin. You can do it yourself if you know a bit about this type of work. If you aren't confident then i myself wouldn't do it.

If you run the race pipes on the FLP system you would get an SES light untill you put the cats back on. That's if you weren't getting an SES light already.

 

so its best to put rear 02 sims?

 

Yea it'll save you time from looking for a ypipe that has O2 bungs for the O2 sensors. Also you wouldn't have to buy another set of extensions.

Do you know the area inspections...like what they check for and all that stuff?

 

Hey i just noticed you have an A4...if you are for performance mods then get a torque converter. That will greatly improve performance more then headers.

 

What he said

 

i already have the TC option open...itll jsut wait for a lil while bcuz i am also looking into the Tranny Swap...cuz i really wanted to get a 4.11 rear and want the gas mileageand a better top end so im going for the M6...ive already decided on that... but a TC will be in 1st...for a lil bit of time

 

oh and for Illinois emissions...what ive been hearing most is that they just plug you in make sure theres nothing rong...like your SES light on or anything and thats it...then they do the other lil checks but not the SNIFFER test...which i believe isthe spot check so they dont see whats there....what do 02 sims do?

 

Seems like they just do ODBII scanning for codes. As long as the SES light isn't then you will pass.

O2 Simms just trick the computer to think that the cats are still in place and working properly.

 

ohhhh gotcha...so in order to install...ok ill just compare the 3

FLP with the cats on...what would i need to purchase?
Kooks with cats what would i need to purchase?
QTP with cats what would i need to purchase?

if ig et it professionally installed will i need an LS1 edit? or would 02 sims just do it or what?

should i go for high flow merge collectors or would it mab cause a lil more rasp and wiould the cats basically defeatt the purpose?


thanks 2001WHITEWS6 for all the help...this should be the last ?

and yeah i believe it is the OBDII scan or watever it is that thye do

 

oh yeah....what are "GROTT" headers...i think that how its spelled?

 

No problem...now that i completely understand all this info i know how confused i was when i 1st started looking.

O2 extensions 24in, O2 simms, new GM header gaskets, oh and AIR restrictor plates since it seems you are wanting to keep the AIR system. You can reuse your header bolts or buy new ones. I bought stage 8 locking header bolts when i did mine. That goes for all the ones you listed.

For the ls1edit it all depends if you get an SES light afterwards. If you do then you can take the car up to autozone and have them scan for codes. It's free. You can then write down the codes and post them on here and people will tell you what they mean.

I would go ahead and get a true y collector just cuz they flow better then 2 welded pipes. That is not going to have an affect on the raspyness. You shouldn't have that much rasp as you are keeping the cats.

To be honest i bought the QTP headers and their ORY mainly because of their ypipe design. It has the flowmaster y collector. It ended up not fitting worth a **** and i had to pay more to get a local exhaust shop to correct it.

 

Grott headers i think were a brand of headers that no longer exist under that name. Kooks, QTP, and Thunder Racing headers are the same style and design as the Grotts were. I'm not sure if the FLP are the same style and design.

 

3. The y-collector is not really for sound purposes but for performance purposes. A true y-collector like the flowmaster y collector that is on the QTP ypipe will flow better then just 2 pipes joined together like the stock ypipe was.

A friend of mine added the Flow Y collector because he heard it would help. He gained 0 hp and TQ. In theory he should of gained something but reality is sometimes different.

As for the rear O2, its only to make sure the cats are working and they don't affect performance. Installing headers should not affect your warranty but the dealerships will give you a hard time. If your motor pops, the dealership needs to prove that it was the cause. Since they can't prove that header cause any problems they will have to replace the motor. You may have to go to arbitration if the dealership gives you **** but inthe end you will win. Good luck brother!

 

can anyone find out if FLP is a Grott. style header....and even if not does anybody have a clip of FLP on GMMG...cats or no cats...preferably wiht them on tho

 

I'm going to say no, they are not. The primaries are somewhat similar in shape/design but the collectors are much shorter on the FLPs.

 

anybody gotta clip of FLP and GMMG....or does anyone kno some1 that does that i can contact via PM or Email?

 

Check out LS1sounds.com That would be the best place for sound clips.