i'm thinking i need to repack my sato mufflers on my RC51 after doing the ART course yesterday. i can get a kit from two brothers for $20, or i can get one for $65 from sato. i'm wondering if it's worth spending the extra cash to get the kit from sato? would there be a big difference in the material used? from what i gather on the two brother's site their kits can be used in pretty much any exhaust.