I want some flowmaster 40 series mufflers but i dont know which kind i need i have a 307 olds engine?

Also my pipes are 2 inches thick.|||Any of them would be fine... No bigger then 2 inch on your pipe size though,bigger then that is too much for a small block...|||http://msxml.excite.com/info.xcite/searc鈥?/a>





ask the experts|||If your just wanting the mufflers.. Any of them will work.. They are uni fit. You or your exhaust shop will have to fab up the pipe and weld everything.





If you mean the inlet/outlet sides.. That depends on the under side of your car and where you want to mount the mufflers.





No way of really telling unless I could see the underside of your car..





Alot of the time offset inlet and center outlet works best for custom installs