is it possible to hook up the ISF exhaust system to a stock is250? i really love the dual stacked exhausts, but i cant afford an ISF right now :(

No.

But you can install the bumper and both quad diffusers... and then hack off the tips from your oem exhaust

Joe Z

will the rear / axle-back / muffler section fit? It looks dimensionally the same as all the aftermarket axle backs i see for sale.. I ask because I have access to a free one. I would just get tips welded onto it.