hey guys I'm gonna be putting together my own y-pipe and bolting up to the stock LS1 manifolds. I was wondering if anyone knew the best place to buy the mating flanges for the stock manifolds, so i can fab them to my y-pipe?

thanks

 

http://cgi.ebay.com/ebaymotors/LS1-F...item415c8f6b17

 

thanks!

 

With the EGR block offs....if i go ahead and do that and DONT flash the pcm to remove EGR function, will the car be extra rich or lean or just throw a code? in other words....is it safe to block off EGR and daily the car without it tuned out for a bit?

 

Have you started the car yet? You have to have someone turn off VATS in the PCM anyway why not have them do everything?

Good deal on those flanges as well. I used gaskets as templates and had someone CNC me flanges, which was $30. And that was the friend price.

 

yea I'm gonna use the VATs bypass module from HAWKS just to get going for now, and later I'll sell it and do a real PCM flash with EGR/VATS/O2 sensors removed and tune work too.

 

now one of those flanges in the picture looks larger and more triangular than the other one, is that an issue or not really? I'm gonna have to check the stock manifolds just to make sure everything is copacetic.

 

Driver side flange is a large oblongish triangle. They are unique.

 

Better link:
http://cgi.ebay.com/ebaymotors/LS1-H...item336ac53a04

Better off just sending the PCM to be done. Used to be able to find flashing on these for $50, but the price went up with the demand. You end up spending less money in the long run, and no banging yourself on the head for not doing this the first time. You also won't have to stop driving it.

 

ah nice! i was thinking about this actually or asking someone in the local area if they could do the quick changes....however in the link you showed me that doesn't specify 2001-2002 which is the PCM i have. I think I've read that things changed, or does that particular seller on ebay do them all? Thanks for the heads up tho, ill check it out!

 

I'm pretty sure 99-02 are the same. You see several different year configurations if you look around. Best bet is to contact the seller, just trying to help you make a good decision.

 

i bought a lq4 that came with some manifolds that have all the block off plates and flanges to make a y-pipe. i have no use for them, going with long tubes, if your interested?? i will check tomorrow and let you know.