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When I get mine I will be doing a sound comparison. Record the cockpit noise with the standard zaust. Then with the KTEC system. Then the KTEC system with the KTEC decat. Oh and exterior sounds aswell.
after hearing various k-tec systems i can say that the twin 3" is easily the loudest, but the 6x3 produces a lovely deep note which is the one i went for
I got one with decat on the 4 slash cut, vey loud, but like steve says it sounds better after being well warmed up, sounds amazing when gunning it, with a turbo like pop between changes, but can be annoying if you are into listening to music in car, or holding conversation with rear seat passengers, sh*t hot quality though, which will offset the times when it will annoy you
I have the 6 by 4 oval and its mental when warmed up properly. Sounds best at 70 i 4th gunning it When its cold it sometimes souds like an old Fiat Not to loud if you take it easy.