I have a 2001 hyundai tiburon.I have installed a header, front and rear strut tower brace, hks super drager exhaust,eibach lowering springs, a [email protected] filter and 16inch fmr rims. I just purchased the big bore throttle body and short throw shifter. My question is with the header removing the 1st cat, and the [email protected] filter and rear section exhaust flowing the engine much easier will the big bore throttle body run okay or should I return it? also for anyone who has purchased a header you need to modify your O2 sensors. I cut and spliced the O2 wires and had an O2 sensor nut welded onto the exhaust after the 2nd cat under the car so that the computer will still get a good before and after O2 sensor reading so that the check engine light will not come on.You will need to purchase special wiring, you need nickle plated wiring for super high resistence to give the computer acurate readinds. you can find it at heating and air conditioning shops, they use it for thermostats, to get perfect readings.