rays - are you okay about replacing your clutch?
if not, then please check on the specs of your clutch and the max torque it can handle as I think the lower spec TDI engines had MUCH lower spec clutches...
the TDI remaps are all about mapping in a LOT more low-rev torque and bit more torque further up the rev range, so even if the peak bhp "only" goes up by 25%, the car will feel even faster than that because you will probably get 40% more torque at low revs... just bear in mind that when they made the lower spec TDI models, the engines are still pretty bullet-proof, but they cut back other components (intercoolers, turbos, clutches). The single intercooler is probably fine, the turbo, if healthy now, should handle a remap easilly, but the clutch is usually the weak point and Audi spec the components according to the max torque that they expect the clutch to need to handle on a factory map...
I'm not sure about the 100bhp in the A4, but I've seen a nearly new 105bhp Polo remapped to 150bhp and the turbo + engine were FINE: but due to the lower spec clutch and the car was utterly undriveable (the clutch with <10k miles on it was slipping even on the rolling road)...
I know the TDI130's clutch is normally able to cope - seen several those remapped to 175bhp+ without any adverse impact, if driven carefully, but I'd be wary if you're not certain the clutch it up to it - at least get it done somewhere where they will Rolling Road and they should be able to pick up even the slightest clutch slip... the Chip'N'Spin RR days as attended by a few forum members in the past (£250 for 2x RR runs + remap) will advise if they pick up any clutch slip and they'll let you test drive it too and map it down slightly if the clutch can't cope.