Bullshit. I drive an R35 gtr currently running 580 bhp and mine is stage2 which consists of an off the shelf map and upgraded airfilters with a y-pipe which is a Decat for the second set of cats. My next step is stage 4 which is 1000cc injectors, 3" intakes with k&n filters, cross-flow intercooler, decatted down pipes and a live map, this will see me to 650/680bhp. To go to the next step you need hybrid turbos, high flow fuel pumps, aftermarket exhaust and uprated circlips on the gearbox, these mods are safe for 850/900bhp. For 1000bhp and over you will need bigger injectors, uprated clutches, forged rods and pistons and more work to the transmission.

So all in all your mate probably works in the mail room or with the micra's.