Lots. how big is your wallet? The quickest and most bang for the buc is in exhaust, removing the air retun, and opening the air box up, and a rejet of the carbs. This netted me 71 hp at the rear wheel at 600ยด above sea level- or 13 more ponies over stock. If you have deep peckets, there is a head upgrade that bores it out a 988 with higher compression pistons, cams, CR straight carbs, new coils that raise the rev limiter, etc... I have seen a dyno sheet from a guy in the club that did this to his Thruxton and is getting 92hp at the rear. fast bike. I have also seen an ad for a guy that makes a supercharger for it. Go nuts but ride safe...