How much HP will an exhaust add?

[BlueS14240sx]

@88slowmarro

save the money man . trust me i had one of those turds . thats why i transplanted a lt1

@MX-5

I suggested he spend another grand and pickup an LT1 car

@PJB

Its a big 2.8. Completely hopeless for making any kind of power.

he laughed when i told him those motors are shit