Whats The Best Set Up??? Help!!

[vin69 TRX450r]

I race mostly endurance races at the moment but this season i want to ride MX as well what the best set up for both???

My set up now is.

HRC kit 06
Lonestar DC-4 long travel +2.5 +1
Lonestar anti vib +1 steering stem
Axcaliber axle +2 +2
Lonestar linkage
Ohlings long travel PDS shocks all round
Hel brake lines
Hiper cardon fiber rims ( 10s on back for endurance and 8s for MX)
Fasst flex handle bars
Ims oversized tank
Pwr oversized radiator
Pep steerinr stabilizer
K&N pro flow air filter
Quad tech hood
Quad tech seat
Ac nerf bars
Ac bumpers
Ac oversized grab bar
ITP tyres XCT for endurance and MXR6 for MX

Iwould like to have a exhaust system( But which one?? help)
and a clutch kit??

Any suggestions welcome!!!!!

[450RGNCC]

It sounds to me like the set up that you have now would be great for MX, you may just need to get your shocks revalved for MX. As for a pipe, there are many great pipes out there, I would suggest HMF, DASA, Rossier.