Dropped my exhaust to clean up as it's looking kinda rusty, and noticed that the Flowmasters are reversed ie: headers to outlet, tailpipe to inlet. Car's been together for quite a few years, runs well. Also header collector is 2.5" and mufflers are 2.5" but running a 2" pipe between the header and muffler. I feel this is probaly restrictive but with a stock 327 would I notice any gains by redoing the system? Would this affect fuel mileage? Other then being reversed exhaust is in good condition.
Gord