not sure wor... other day saw the zenden 4-2-1 at redzone the shinning finishing not bad just dun know the quality leh... outside inside very hard to jude... see the magazine ad powerzone 4-2-1 less the shinning "coating" plus pricely.. for me since i run in tight budjet i shall go for zenden since oni cost 200plus niah..
wonder y they dun offer sample before we buy???? test jor den we can know lor...
when dis happens my rev feels like a pull back, drop of performance for 1 sec,,,, on dyno machine at each run, it always happens at dat region, thus im not able to pull above dat region, as da a/f ratio fluctuates up...