Just got a 2003 350z touring with the vq came with stillen headers, valve body and exhaust and it’s got a racing pulley what are some mods that overall will make it more reliable

 

Driver mod so you dont end up in a ditch on Dugan day, which ia right around the corner

 

Taking off the front and rear bumper supports will reduce weight and therefor decreasing the load on the engine. Increasing reliability

 

Start by upgrading the fluids in your Z with products that meet or exceed factory specs. Replace old brake fluid with DOT 4 brake fluid with a higher dry boiling point should be a good example. That same brake fluid can be used in the clutch slave and master to make your clutch more reliable. The list goes on and you can read multiple threads on here to determine the best fluid or lubricant to improve reliablity.