I just bought a stock R and want to know who you might recommend for a big bore kit, pipe, etc. I have looked at esr but can only find their 370 fit. just lookin for a little help

 

I'd highly recommend ESR for big bore kits. I have ran 2 of Eddie's 310, currently have a 310 PV and they have been awesome. The link I gave you shows their 330 and 310 big bore kits. Eddie's pipes are second to none as well, in other words you cannot go wrong with any of ESR's products for an R.