strut brace should fit fine mate!
no offence in this but are you sure the inlet manifold is on properly ?
What strut brace do you currently have?
Although prob not possible it's maybe upside down..
As Kozy refers to, weight is weight, less is better in a car.
Weight is better in some places than it is others.
Weight above the CG is bad, weight below it is OK. The more weight below it, the lower the CG is.
Weight in front of the CG is bad, weight behind it is OK. The further back you add weight, the more you move the CG rearwards.
Weight above and in front (bonnet/strut brace) is really bad, weight below and behind (boot/floor area) is actually kinda good. When autotesting and on track, I always kept my tank full and the spare wheel in place for this reason.
I'd happily add a heavy aerodynamic flat floorplan for instance. Low slung weight stretching right out to the back of the car helps to lower the CG and move it rearwards, it would benefit the handling more than the increased weight would harm it.
Obviously the power/weight ratio is affected, but you can always add moar powaaarz!
weight is weight, you can move it around all you want, weight takes away from performance.
It's easy to lose weight from low down and far back though. Not easy to lose it high up and up front.
But if you think that losing 50kg and shifting the CG upwards and forwards in the process works for you, who am I to argue.
I just know mine drove better with a full tank and the spare wheel in the boot (about 40-50kg total).