Youll have no problems at all, in fact Roamer had a Viper and Zorst fitted before Christmas and he reported an IMPROVEMENT in his MPG. A Superchip with a custom map will sort out your fuelling if you want to get the Viper - the trouble is they (Vipers) work a bit too well and the engine can run a little lean hence the need for a custom map. The Superchip with custom map costs about £350 I think.
If this sounds a bit daunting just get a panel filter instead of the Viper (there are plenty of manufacturers - Pipercross, K&N etc).
Youll love the Magnex if you get one - gorgeous noise, without being too loud. I was a bit worried before I got mine but its just perfect.