A couple weeks ago I was at my dad's friend's house because he is selling parts off his GTX to upgrade them when he gets his new s/c (car ran low 12s so I know all the parts are good). He let me take him his throttle body (72mm) w/ a spacer on it to test it out to see if I would want to buy it. Then on Friday I ordered the K&N CAI from wbodystore and once I get that I'll put them on at the same time. So my questions are what all will I see with the TB and TB spacer? power? sound? knock reduction? He said he'd sell it to me for between $100-$150 and I looked on ZZP and that would be like $250+ so it seems like a good deal. Is it worth it?