450r Big Bore

[#1speedbump]

Does anyone know who is or will be selling big bore kits for the 450r? Also what exhaust are you owners recommending? Thanks for the help

[Silverfox@C&DRacing]

JE is making a 500cc kit for the 450r we hope to have them sometime in the near future.
I have seen alot of HMF and Sparks pipes on the 450r.

[EXDUNER127]

I heard sparks pipes are putting the best gains on the 450R.
My engine builder is selling alot of them!

[Dunlap]

500 KITS ARE IN STOCK.