JUN 280 racing cam shaft VS oem

JUN valve spring......why do i need this..? answ...OEM may float during high rpm and high power..especially 400whp and above ur engine might be like fuel starving... but when i got this spring and try to see any diffrent..well both are similar in shape, just that jun has more roundness...how ever when i tried to compress to see the spring rate..both of it are bout the same..hmm..

280 duration with 11mm valve lift. at first i would like to have tomei racing cam shaft, but since many seller got no stock than i change to JUN...why tomei...? becouse tomei has 11.1mm lift and proven more power can be produced..try to google on "cam test"...

let see the dimension on pictures above... JUN =36.38mm , OEM = 35.32mm... so diff about 1.06mm

the JUN cam looks so beefy...to open the valve much more longer so than more air can be forced in to combustion

GSR open diff VS EVO LSD

lets take alook at these two different differential. GSR open and Evo LSD viscous
GSR 1.8 final drive is 15/58 while evo2 has 15/64 which abit bigger at pinion gear. so can these two LSD swap or interchangeable to GSR GBox housing? many people say that both can be change easily as they share the same configuration.

the securing bolt are same orientation but different in location. u may see why after this.

above is the lenght between two bolts which is 16mm on GSR but evo is way2 much more bigger u may compare the location around the bolts between these two LSD

above pic is to shows dimension No.1 on LSD's body can't be interchanged between the pinion gears. dimension no. 2 show diff in bolts location. u may sent to mechine shop to cut it but i belief they can't do it couse those are harden gears.

if u swap whole LSD evo 2 in it will fit bcoz of same bearing size but u may tilt the final gear away from its position.

conclusion = They are not interchangeable..... anybody had done it.? please share here for suggestion..