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+1 on the UMW flash (got it and love it). Europipe seems killer, but i rather allocate the $$$ a lil bit different so I am out looking for an alternative.
I've got an FVD flash and PSI exhaust with gutted cats and put down 428 wheel. Most tuners can remove the cel for catless exhausts. The nice part of that is running a lil mix of race gas which can give you a nice 20-30 wheel alone. I gained 3 mph in the 1/4 with 112 octane. 60/40 mix 112/93.