OK, you've got an '08' hawk, correct? That means it must be an 800 and that it has the 12 gal tank - and you still need more fuel capacity? Various guys have made brackets for holding a 2 gal gas can. The 2 mounting spots for this is on/in the tail section(fender), or incorporated into the snowflap at the end of the track. I'll have to look for where pictures of these can be found, but keep looking through the threads any you may find them yourself.
You should definately get suspension relocation brackets to correct the geometry of the suspension. There are 2 or 3 versions out there. Sledr2 makes one that just relocates the suspension pivot point. TLKD makes a bracket that I believe does that and relocates the footpegs backwards and 1" or 2.
I imaginge the original exhaust was the Matech, correct? Surprised to hear you melted plastic as there are so many heat shields on that thing. What exhaust system did you change to Jaws Gen 1, Jaws Gen 2 or a costum? I'd suggest ceramic coating to reduce the possibility of melting plastic, to prevent the pipe from rusting out over time and for the "bling" factor.
Get an anti stab kit from Sledr2 for $150. "An ounce of prevention is worth a pound of cure."
With an 800, you should also get an engine torque brace from TLKD fo $100.