Might want to check out that GT Motoring slip-on X-pipe, that cuts out half of your X-pipe and replaces it with a slip-on clamp section, as a partial solution? As for primary section, J08 is right, it'd be more economical to just buy a full x-pipe instead.
Past: Toyota MR-S (Small)|Toyota Solara SLE (Terrible)|AP2 Honda S2000 CR (Rear-Ended By Big Rig)|E92 BMW M3 (Lemon Law Buyback)|Second E92 BMW M3 (Mechanically Problematic, Sold)
Present: 997 Porsche 911 (Perfect)|Mitsubishi Lancer Evolution X GSR (Impractical Daily)
Future (Planned): Subaru WRX STi Hatchback (Practicality Coming Soon)