Does anybody make a Y pipe with a 2.5" merge? I ask because the stock exhaust is 60mm ~ 2.5".

 

Wait what? You mean 2.5" by the inlet or outlet?

 

dont think I've seen one with 2.5 inch; Tanabe's is 2.75 though which will mate perfectly with the stock midpipe

 

I mean out the outlet going into the midpipe. how will a 2.75" pipe mate perfectly with a 60mm mide pipe?

 

the holes are slotted, so it will bolt up yes

no real point in any aftermarket company making a Y pipe to bolt to a stock exhaust as there really isn't a market for it. All the exhausts that retain a Y pipe will be in the 2.75-3 inch range for the midpipe, so the Y pipe matches up

 

Why are you looking for just an aftermarket Y pipe when you're keeping the stock exhaust?
Might as well get something like test pipes or HFC's?

 

http://www.exhaustdepot.net/g37ypipe.html