Springs are just the same as on any other car, there not difficult. id go for an enclosed induction kit, or panel filter, as mondys suffer heat soak as the air box is behind the battery, so will the induction kit be. exhaust wise, stick to the main brands, magnex, scorpion, milltek etc. ive got a blueflame stainless on mine, they build quality is great, you get good gains, and they dont sound over the top.