are a 4 into 1, and why? I have a 1990 kawasaki zx11.And i would like to know witch muzzy exhaust would give the most horsepower, two slip on mufflers are the complete aftermarket exhaust system. Also witch is the louder of the two?
Full system will give you an increase in power with jetting. Muzzy is the hip pocket company for Kawasaki performance and you would be best going with a Muzzy system. Much time has been devoted by Muzzy to produce the best and most compatable exhaust systems to the ZX models, especially the ZX-11, ZX-6, ZX-9 and 7. You will get the best performance overall from the Muzzy. Acropovic is a Great company and I prefer them myself but they dont make systems for the ZX-11. Typically a 4-2-1 system yields better flow charictoristics on most bikes, because of the lack of bottle neck effect in exhaust flow resulting in a more tunable engine. Contact Muzzys or a performance shop and there are systems still out there for the ZX-11. Muzzys are loud pipes too. Another brand that works well with your bike is D&D. theyare similar to Muzzy systems.