Im not sure...

[my98SVTturbo]

Im going to have MSDS headers and a custom set up fromt eh converter back (2.5 piping with borla mufflers) my question is which set up would bolt up to the headers and provide the most gains, MSDS y-pipe with magnaflow highflow converter(2 bolt flat or round?) and or BAT y-pipe converter combo stainless steel

[BrApple]

since the MSDS exit is located at the same location as stock any w-pipe that will fit the car will fit ...

[HolyRollerzC3]

I really dont know about gaines, but the msds ypipe takes two 2" pipes, and brings them into a 2.25" pipe IIRC, and the BAT Ypipe brings the two 2" through a 2.5 outlet cat and comes out through a 2.5" flex! So i think the BAT will flow better then the MSDS ypipe!

[my98SVTturbo]

okay yeah so the bat comes with a cat and flex and comes out to a 2.5" so yeahthat`ll probaly work better for me.