gonna be installing some Pacesetter LT's and was wondering which type of extension i'd need? The flat head kind or the square?

 

You will be eliminating the rear (square) so you need the front (flat)

 

I just looked at mine last night and yeah they are flat, Some ppl get away with only needing one extestion you might want to ask how many you will need,

Also i have been told that the first week or so with new headers will ruin your 02's so you might want to just plug the hole for the first week or 2 then put in your o2's

 

I needed both extensions. I think I used 24" I've never heard about ruining your O2's. I didn't ruin mine.

 

Maybe it is just with the jethot LT's
Something about teflon in it, and the heat cycles releasing it and fugging up o2's

I ruinned mine and a know a few locals that did the same, but who knows it might just have ben their time to go none of them where new except 1 guys

 

shew, i hope it doesnt ruin them cuz i plan on putting new ones in while we do the headers. new plugs/wires and front o2 sensors. since i'll have the rear ones programmed out, i guess i wont need to replace those.

 

I have jet hot's and no problems. If you're worried about it though, just use your old ones and then change them in a few weeks. They are SO easy to get to.

 

i really dont see why it'd ruin them, but i just might do that. just to be safe.

1 other question: the y-pipe that comes with these Pacesetter LT's i bought doesnt have cats built in. this doesnt mean i'll have to be rid of my cats, does it?