Quote Originally Posted by blue_gt
some say that you need the back pressure from the exhaust. how come some people go to the drag strip open header? i was just wondering cause me and my brother are taking his celica gts to the strip
mods are intake, exhaust
Open header is subjective in all honesty.

Usually versus a normal sized exhaust youll pick up 5-10whp TOPS. If you have a properly sized exhaust with no cat, the difference is almost non-existent.

On that particular car, 2.5in exhaust is optimum, so if you dont have that, if you run open header youll feel a tad gain.

It wont really cause any damage because its not going to lean it out that much if any at all. O2 readings are taken after the collecter of the header anyway.