Im planning to get some tri-y LT's soon, I know Ill have to get a custom Y pipe made. I'm planning a flowmaster y, but dont know what size to get. 2 1/4" to 3", 2 1/2" to 3", or 3" to 3 1/2" then go thru a 3 1/2" to 3" venturi for possinle future plans. If I do what I want, Ill probably go with a completely new exhaust set up, so the 3" to 3 1/2" is the one I m really not leaning to, but dont know if I need 2 1/4 or 2 1/2 intermediate pipes.

Or other sugestions??

 

What are your current and future mods?

 

my exhaust is it sits now is like this dynatech lts, 3" cutout right of the collectors, no cats to a factory exhaust flange for the intermediate pipe to a corsa sport system. My y-pipe is built exactly like pacesetters except I have dual 3" cutouts on it. I like it since i can have it quiet running down the road and loud as hell when I want it too.

 

Oops I guess that would be helpfull.

Currently running a 6l with a 223/226 cam Ebay intake and efans. Im geting teh headers soon , my future plans for the motor are only Nitrous, and possibly stepping up to a 408, but Im not holding my breath for eigther.

 

Make sure I understand. You come off the collector 3" to 3" to a 3" Y to 3" exhaust?? What Y pipe are you using? You should have swung by on your way through......wait nevermind

 

Yeah its all 3" CurtD from this board made it for me in Birmingham Ill go get a pic of it for you give me a few minutes.

 

here are two pics my damn camera is taking a **** when I switch it to camera mode it turns off


the drivers side basically looks the same as the pass side the cutouts are angled wierd so that I can pount me electric acutuators on there and keep them up out of harms way for the most part.

 

Thanks slow. You still didnt answer my question though should I use 2 1/4, or 2 1/2? I dont need 3" even with my (hopefully) future mods, my setup wont be as extreme as yours. Ill stop at a 408, maybe with a radix (if I ever win the lotto)

 

2 1/2 thats what i had on my cammed 5.3 and it ran well. 2 1/4 is too small IMO. With a y-pipe thoug you are combining both promaries into one so your exhaust is really only going to flow like a single 3". If it was me and I was going to run a y-pipe with your setup I would get the 3" if I was going to run duals then dual 2.5

 

Well I had planned to buy the Flowmaster merge connector (y) and the y have a dual 2 1/2 in to a 3" out, and a dual 3" to a 3 1/2" out. If I did this then Id have to reduce back down to 3". If I do ever get around to building a 408, Ill go with a different set up anyway, so I dont thing I need 3 1/2. Its also a PITA to find someone around here that can bend 3" without crimps. I can get 2 1/2 bent good, I'm not too worried about the crimps behind the muffler (Ill just open the cut out) but I dont want them in the Y pipe.