As of this moment, the ol' AWD sedan is tuned for 2.5" HFC going to a 2.5" Y-Pipe to stock mid-pipe and back. The car runs smoothly and all but I recently splurged on a 2.5" Fast Intentions CBE to match up with the converters. Not only will there be a difference in diameter but piping configuration as well (Y to X pathing), which leads me to the question...

Would it be worthwhile to have the car tuned again after changing to this set-up? Part of me thinks there won't be any noticeable gains, being that far down from the engine, but a separate part thinks the escape velocity won't be a great match for the exhaust anymore ie; funky throttle response and things of that sort.

What is everyone's $0.02 on this? I'm newbish to the world of tuning and beyond this, don't plan on doing any further power mods. Just trying to make sure I approach this new shiny toy in the correct manner when it arrives