I'm trying to find a good system that has twin dual tips instead of the normal single outlet My car is a 2006 TL 5-AT. Iv seen O4 with flow masters that look insane how much modification would i have to do to do to get a flow master on my 06

 

Probably not more/less as any other mufflers , that is if your just adding Two rear Flow master mufflers w/ tips to your stock exhaust

 

You can run our quad tipped exhaust but you would need to run a TL-S rear lip or bumper.

http://store.excelerateperformance.c.../i-222774.aspx

 

^this

or modify your base bumper

BTW OP if you search you will find threads on this type of topic

 

here is mine if it can help!!!

http://i1153.photobucket.com/albums/...bumberside.jpg
http://i1153.photobucket.com/albums/...tbumberaft.jpg

I'll try to find the magnaflow P/N if you like them. They were like 65$ each