Technically, if u want it to fit, it will fit, it's just the amount of work required...
I see that ur exhaust does not have a mounting point so u need to get the exhaust shop ppl to get it welded to a bracket before securing to the car.
as for the connection to the intake point, as long as urs is a 1 in 2 out system, it will fit a 318. And i supposed, it's gonna be welded...
But i find it funni that u went thru so much effort to make it look nice ? If u only want aesthetic, might as well just get the tip than to change the whole exhaust... But that's just my opinion... have fun modding...
See ya on sunday