Any street porting is fine. Hence the name "Street". when you start bridge porting your stability goes away. You can drive it and stuff but you gotta have it tuned properly. Peripheral ports arnt stable enough for a car you would be driving on a regular basis. Not to mention there loud as fuck.
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Driving definitions: Understeer is when you hit the wall with the front of the car and Oversteer is when you hit the wall with the rear of the car. Horsepower is how fast you hit the wall and Torque is how far you take the wall with you.