Hi guys ...just get to know about performance here as I altered 2LtE SX5 to 5vzfe ....gear box is original having default gear ratios with original 8:39 differentials ...here I got confused as 5vz fe comes with 10:43 diffrential having the same gear ratios in comparison with mine ...but final drive ratio is different...my vehicle does not go beyond 130km/h..things I already done (spark plugs, injectors ,MAF,exhaust ,throttle body ,all earth wires checked,) by knowing the power of 5vzfe just wanted to touch the beast with 180....cause if not getting full performance of engine ,,,makes doubts on reliability...seeks guidance.