I just bought my 2005 tl and i love it. Now my question is i want to upgrade my exhaust but i dont want to be to loud. I seen people here going custom and some go with comptech catback, with one would be better in power? if custom what size piping do i need and what kind of exhaust do i get.
Thanks

 

A number of folks got custom magnaflo systems. Don't know the specific details but a search will get it for ya. Try this one and this one.

 

there is a lot of good info in the parts/performance subsection