heres a basic list of stuff you'll need.
SSM lower intake manifold adapter plate
03-04 cobra plenum
03-04 cobra TB
03-04 cobra MAF
larger fuel pump
cowl hood with minimum rise of 3-1/2"
extra idler pulley for sufficient belt wrap
UDP's or oversized blower pulley to lower boost to around 6#
one outrageously long drive belt
some other stuff i can't remember...
with the M112 in place, you should expect around 250-270 rwhp when done/tuned properly.
i was considering this for a while and decided against it, mainly due to these 3 reasons:
1. the biggie: no way to intercool it.
2. 3-1/2" cowl hood. where's the sleeper effect ??
3. a roots blower is very hard on the internals of the engine, and, not as efficient.