What kind of supercharger do you have? I'd say if your running 9psi, YOU NEED HEADS, AND INTAKE. A good head combo, would be worth
100+ hp. If your planning on racing alot, and driving it hard with 9psi, get a TKO II, yeah it'll hurt your wallet now at around $2500+ wth everything said and done, but do you want to chance it and grenade 1,2, even 3 more T-5's. or if your on a budget get a Super duty T-5, from jegs,summit, d&d expect to pay around 1000-$1100. Tell us your plans for the car.
They seem to have pretty good prices. Their TKO II is $1899.
But that is the cheapest around it looks like. They had an add in MM&FF for rebuilt T-5's upgraded to T-5z's for like $700-800, might be worth a look. Again, if you tellus your plans for the car, we can easily steer you in the right direction.
www.ddperformance.com