Are there any easy add ons to make more torque on a 170?

Bigger engine is really the only effective way to get more torque.
Peak Torque happens fairly low in the powerband for most street cars and most stock engine are fairly efficient there. Torque is how much fuel and air you can get in the intake stroke (CID if both engine have the same VE) and HP is how much fuel and air you can put through your engine over time (RPM).
Gears are also an factor to torque at the wheels not just the crank cause an engine with 300lb-ft x 3:1 rear gear is 900lb-ft to the wheels and a 250lb-ft engine with 4:1 gear will 1000lb-ft to the wheels.