Modifying my s4 na
 

it's an 86 GXL, low mileage
im planning on a mazdatrix 4.3 to 1 final drive ring and pinion
the racing beat true dual exhuast, also from mazdatrix
a light flywheel, either aluminum or steel, but i havent decided
im also getting the Hawk HPS compound pads to help slow down the extra oomph

i drive it only when im home from school from may to september, but it's my daily driver when i am home so im keeping it relatively stock

im gonna replace all stock speakers and replace them, and add an amplifier.

sound good to you guys? do you think those performance upgrades are reasonable? should i do anything else to keep the rest of the car par with the added power i will have?