[RickM415]

ok here was the combination ...lsx 6 speed twin turbo 1-3/4" headers then 3 inch downpipes x-pipe 3" borlas and 3" over the axle exiting at a 45 degree angle by the quaterpanel ends

at idle it sounded like a stock ls1

regular driving the engine appeared to be louder than exhaust

full throttle fairly loud

i belive they are 16" housings

hope this helps ...by the way nice car you have