Need to replace the rotted out mufflers on my K5. It currently has on "Rino" mufflers......I really like/d the sound of them but can't find them anywhere..... Anyway, Flowmasters are cool and all but I don't really want to spend $150 on a pair of mufflers. The Summit catalog lists the house-brand turbos at only $15 each so I was tempted to try them. Anybody have any experience with them? How do they sound (let's say compared to a 40 or 50-series Flowmaster)?