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you can **** the timing up when tightening the pulleys onto the cams, if the pulley tool isn't tight enough the pulleys will move
and you checked the mark on the flywheel was lined up etc??
i'd 100% re check the cam timing, even the best of us can still **** things up, rules it out then
i've seen people drop a rocker off when fitting cams so you end up with a 15V
^but with this "restriction" it can actually help increase the flow by increasing the gas velocity after the "restriction" ie in other words this pipe reduction helps cause the gas to be "sucked" out the cat
pulse tuning yada yada, its all complicated stuff
in simple terms, leave it LOL
its all to do with velocitys, venturis yada yada
its a road car, at the end of the day you won't change the earth's orbit