I have a 08 sti with 3" center pipe with a single 4.25" rear HKS muffler. bye bye dual exhaust... Engine upgrade is only a Injen intake. My question is...is there anything I can do without spending any money to free up more horsepower? I recently lost my job (thanks economy), and have no money to tune or upgrade. I am very able when it comes to working on my car. Thank you
Grant
Grant