I am installing headers this weekend and i plan on using a magnaflow merge and having the muffler shop make the rest instead of fooling with a full y pipe. they are ebay headers and the driver side header points toward the floor of the car, which is why i wanna have it custom made. the collectors are 3". I guess what i need to know is what size inlets/outlet i need to order.

 

Sup jiveass. I've looked at this a couple times. There are some great threads that deal with it. Gl

 

E.I. I have a 3" Y-Pipe w/an Magnaflow, sweet sounding. Its really up to what you want to do.

 

3" inlets, 3.5 outlet. 3.5" i-pipe.

 

thanks for the info fellas....looks like its takin longer than i planned...motor mounts are a real bitch...