Adam2001WS6

iTrader: (1)

I am looking to get a full exhaust install done here pretty soon. I'm still deciding on headers (think i'm going with kooks) and whether to go true duals with stainless steel piping or do a y-pipe with a nice catback. At any rate, my question is, I would like to know the reasons to use 02 sims vs not and the reasons for keeping the a.i.r system or ditching it... I have several other questions, but would like to start with these first. Thanks.

Adam

neutron82

iTrader: (26)

you can use o2 sims but they aren't necessary... if it were me i would just wait until you get the tune done and just have the codes turned off all at once... if you buy o2 sims you're still gonna need a tune to get the most power out of the car and to turn off any other codes such as air, egr, etc, so buying o2 sims is extra unnecessary money spent... you don't need the air pump, all it does is heat the cats up faster so the o2s work sooner which reduces emissions, but how many of us actually care about that anyway?... there are far worse things screwing the world up but that's another topic in it's own... plus it will clean the engine bay up a bit... same goes for the egr if you have it

blkdkz28

^ that guy is a genius

504ls1

iTrader: (1)

and i think o2 sims are illegal now and not many places carry them so you have to pay a lot to get them shipped

neutron82

iTrader: (26)

alot of the stuff we do to our cars technically could be illegal but we all do it anyway... o2 sims can be had for around $50 shipped all over the for sale section and ls1speed has them new for $100 and i'm sure there's lots of other places that have them if you really do want them but like i said it's unnecessary just save the money and put it towards your tune

Rossi396

iTrader: (1)

Adam:

Can't go wrong with the Kooks. As for the sims, I didn't need them on my C5. You may have a harder time with no tune on your car, but I'd suggest trying to drive it before you buy the sims. As for the tune, why not go mail order from a reputable vendor? I did that with my car and was more than satisfied. You get your O2's tuned out and your car runs better to boot. Cost was $149.00, including shipping...!

Good luck!

Rossi

neutron82

iTrader: (26)

frost does the mail order tunes and he seems like a reputable guy from what i hear... your car will drive just fine with no tune, you will just have your ses light on for rear o2s, and air/egr if you removed those... your car will be running rich and with a tune you will get back alot of lost power... kooks is probably the best as far as longtubes go but they are the most expensive as well... there are more cost effective headers that will still get you good gains... pacesetter, hooker, jethot, arh, etc are all good headers and most cost half of what kooks do

Adam2001WS6

iTrader: (1)

I'm definitely figuring in a tune with the exhaust install even with many saying just wait until heads and a cam are in it. I want to get the most power out of it now. So it basically comes down to air or no air... and it sounds like if I'm ditching the CATs then I should ditch the air pump and plumbing.

If I do go this route, I'm only looking at headers with 02 bungs built in them and there won't be any rear 02's bc the computer only needs readings from the fronts to control air/fule ratios... correct?

neutron82

iTrader: (26)

yeah if you have no cats the air pump is pointless... and you are correct, you will have no rear o2s and only need the 2 front ones... you have a few options on o2s... you can either get o2 extensions, extend the wires yourself, or get corvette rear o2s such as the bosch 13111's... currently i'm running untuned and i don't want to replace my o2s until i get to that point because you will risk burning the new o2s up due to running rich... so i just extended my stock o2s and i have had no problems at all... when i get it tuned i'm going to replace my o2s with the bosch 13111 sensors so i will have fresh o2s... and i'm also looking into a wideband and gauge to top it all off... you don't have to do it that way, it's just what i plan on doing and wanted to give you all the options that i can think of... i would definitely get a tune after you do boltons unless you plan to do the heads and cam swap very soon afterwards

Mumbles

iTrader: (5)

I went with LT's with the emission fittings for my 99 Formula. Its just a couple more things you have to hook up when you do your header install. Not that big of a deal. But now I'm looking to get an LS6 Intake, so that will eliminate the need for EGR fitting on the passenger header. So once I upgrade the intake, I'll need to block off the EGR port.

I will always run cats. (Ever little bit helps, right.) But I really no longer see the point of the A.I.R. System. Serioiusly, how much better do the cats perform once they are warmed up? And it can't take that much time to get them up to temp once you've started you car. I will definitely go with the Race Style LT's next time. Ditch the EGR & A.I.R. and don't bother with O2 sims. Just deal with the SES light until you can get a tune. Good luck dude.

Adam2001WS6

iTrader: (1)

I've seen some people say they are going wideband, can you explain to me what that means? Also what do you mean "gauge"?

neutron82

iTrader: (26)

our factory o2s are narrow band and don't give very accurate readings... a wideband will give you a more precise air/fuel ratio and you can get a much better tune when using one... i want to run mine all the time so you need a gauge that you can put in the pillar or wherever you want that displays the readings of the wideband that way you know where your air/fuel ratio is at all times... if your running someone and all of a sudden you have a lean spike you will know to let off and can possibly save your motor... that's why i want it there all the time... some people just use it for tuning purposes only and remove it when they are done... i have heard innovate makes good wideband controllers... i'm currently looking into the dynojet wideband2 it looks pretty good as well

Adam2001WS6

iTrader: (1)

Interesting

Adam2001WS6

iTrader: (1)

So do any companies have a bended up system that would mate up with some lond tubes? I've only heard of the bassani true dual, but that only mates up to the stock manifolds, therefore, not interested....

neutron82

iTrader: (26)

i have the bassani duals and jethot longtubes and no cats... it didn't take very much to get them mated together... any exhaust shop can do it... it sounds really good i get compliments all the time

Adam2001WS6

iTrader: (1)

Do you have any other mods? sound clips/videos?

neutron82

iTrader: (26)

just longtubes, duals, ls6 intake, ported throttle body... i don't have any clips of mine personally but there are a few clips on youtube... it's really quiet when cruising... you can have the windows down and be able to talk on your cellphone just fine... but starting around 2k rpm and especially after 2500 rpm it screams... so you will have no probs being heard if you want to but you can still keep it quiet for the cops haha... and there is absolutely no rasp which is commonly associated with the y pipe setups

Adam2001WS6

iTrader: (1)

And that kit comes with an X-pipe or H?

Jimmy P

iTrader: (177)

Alot of the LS1 type shops can make you a custom true dual system if thats what you would like.

Adam2001WS6

iTrader: (1)

Yeah, I'm thinking about just going that route, but I'm wondering just how expensive stainless steel is going to be with over the axle and out the rear like stockers do...