Heeey!
I had a 1.4 SE for my first car, they're pretty cool cars from factory so don't need much work to make them look good!
If you're looking for a bit of a 'roar' when you accelerate then an induction kit is the way to go.. or if it's a constant noise you're after, I'd suggest replacing the exhaust, whether it be backbox or full system

I had a Sportex backbox on mine which I purchased from a scrapyard for £15 and it sounded really really nice! Not like a chavvy jap can on a 1.1 Saxo!
Here's a pic of my old 1.4 SE

I kinda miss it, but then I look at my current car and think "that's better!"