I'd simply be careful of the claims from this perspective -- if they put their kit (module, cap, wires, coil) on to replace a tired, 100K mile set of stock components, some of the gain could simply be from renewing tired components. You might want to ask them if they dyno tested against brand new factory components. I'd also like to see the whole curve as opposed to the purported max. increases. I have upgraded cap, wires and coil on mine - from different manufacturers (MSD and Ford Racing). I'd probably try their TFI module, but only if mine took a dump and had to be replaced anyway.