IMO

Upgrading your exhaust system is the least cost-effective way of adding hp & torque output to a small-displacement engine.

Simply put, there are a lot things that can go wrong when upgrading an exhaust system unless it is a bolt-on upgrade. A sloppy welding job will even impede the flow of your exhaust. :nono:

A port-and-polish from a reputable shop (plus a free flow air intake) is the best stepping stone for future upgrades.