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
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Rick
1969 camaro rs ss
ls3 twin turbo 6speed will be done when the browns win a Super Bowl lol