A complete system comes with the extractors *headers* 2.5" inch system all the way thru with the resonator, tip and all my orignal one is in my garage might put it up for sale tho, and to be honest with you i dont regret a second i spent that money, and yes system well thats next to come for my car its still stock!, But yeh back to the subject i was just as happy as it as i was when i installed the CAI it roars much louder :D and moves alot quicker esp with trd quick shifter i dont even have to worry bout keeping it in lift anymore. goes in easy like a vtec :D