I've been very happy with the two Akrapovic pipes on my 525 and my dad's 540. Bottom end and midrange pull were the most noticable though. The longer headpipes they have lend themselves to that type of power. Fit, finish, and durability are second to none. Install/removal when working on the quad is easy and the brackets have never broken, springs fit like they should, and bolts don't back out from poor fitment either. I've never seen much information on the LTE so can't comment on that one.