I was pricing what a complete exhaust upgrade would cost me and its come to about 1000 with the following items
A braincoating port/polish/coating job on the manifolds
The needed dead soft gaskets
New O2 sensors with long leads
New high flow cats
Magnetflow DI/DO 2.5 high flow muff
An exhaust shop running the duals with giving them the items above
and a break in the duals so you can unbolt half the exhaust to make dropping it easier.
Is it a good combo to shoot for?
Where to begin.....
Let me help you with you budget realistically...
Braincoating port/polish/coating job on the manifolds....
"The needed dead soft gaskets"
your running ported manifolds not headers you really don't need
dead soft gaskets... I've been running felpro and ford manifold to head gaskets forever with no problems... this just seems a bit much for manifolds... but thats your call.
Depending on how far back your moving your cats you may or may not even need 4 long lead 02 sensors, you might be better off buying two long lead 02 sensors and two standard 02 sensors and a pair of 02 sensor lead extensions, if you don't need the extensions return them
I have nothing against high flow cats or the magnaflow di/do muffler.... but why 2 1/2?
Sure lots of people on here are running it but unless your running dohc, explorer motor swap, turbo, supercharger, or something of that nature I really don't see the need.... you wont be making enough power to need that big of an exhaust diameter... there is such a thing as too big, if you go too big for the amount of power that you will actually be making your only going to end up robbing yourself of power in the long run, to be honest I really don't see the need for 2 1/2 even with PI heads on an NPI block... you might want to re-evaluate your horse power goals and compair them to the exhaust size chart. I'm running 2 1/4 duals with a magnaflow midmount and two mufflers out back with no problems on NPI heads a PI intake, porting, polishing, and high compression... Later this month I'll be porting my manifolds replacing my upper cats with high flows, and putting on my PI heads and I still wont stray from 2 1/4....
Definately get a break somewhere in that system because it sounds like you have some driveline ambitions ahead of you.
One last thing I recommend though.... stage 8 locking fasteners for the manifolds to heads
Just my $0.02..... hope it helps.