quad exhaust and rear bumper question

if i get jetex quad exhaust then does that mean i need to get new rear bumper?
 
 
 
and where do people buy a3 that already has otteinger kit. 

You'll need the rear valance i think its called.  That has the cut out on both sides for that type of exhaust system.
 
Mind you, that will make your rear bumper look lower then the rest of the car if your looking at the car from the side.  To prevent that look you need the whole kit.
 
You'll need to get it painted also to match.  Oettinger kit. ABT, zender, are all body kits for A3's
 
Or if your handy, cut out your rear bumper, if you crawl underneath the bumper you'll see a series of clips wich are easy to remove.   Good luck.

i was afraid of that....i dont want to get the whole kit so you think the body shop can cut my rear bumper?

That's the most cost effective way but, also will not look perfect.

wut do you mean it will not look perfect?