Wattage will not effect your model,any how,i have done with my previous car of omni model 1994,wagon r 2005.
90/100 watt setup requires Relay,Wiring(with ceramic holder) and 100/90watts bulbs
Go for the complete wiring kit which comes which requires no cutting,simple 20 mins procedure.Connections are as follows.
1)See they take power directly from the battery.
2)another connection is taken from one of the Female connector of OE headlamp,by connecting it with male connector of relay wiring.
3)Rest the relay wiring is directly grounded to the body.
No wires were cut through.
Warranty issue:asked SA,they told me only headlamp warranty will be voided,If any of the wires are cut through.
another thing some of they TAI
guys claim,it may blacken your headlamps,or turning into pale due to heat.But mine experience,none happened with my last car.