i have a set of soul catted donpipes i bought for my 600LT.... bought from Vivid. I bouight them just in case a custom set i ordered dont get to me in the next 2 weeks. and yes i could return them to VIVID for full refund.... unless ur near houston (save me trouble of shipping) and willing to come close to what i paid like $3800...but then u could just buy direct from vivid (unless they are backordered)
You could buy the stock set offered above and gut both secondary cats. You would be left with 1 600cel primary in each pipe. Soul pipes will give you 1 200cel primary in each pipe. Certainly not as free flowing but worth a thought if the price is right. Would flow much better than the 1200cel per pipe stock pipes.
I do have soul pipes and like them a lot. Tons of turbo noise. Just something to consider in the paragraph above as another option. Soul with sport rear section is perfect IMO. Cold starts are crazy loud though.