you know full well what my end of the debate is...to use your stock ecu and worry about putting the car back on the road.....for the record...good luck with an E11, the E11, all the shit you need to run it, including a laptop, knock sensor (no, you can't use your stock one, and yes, they are expensive), map sensor, boost control solenoid, harness adapter..you may not have realized, but that shit is NOT included with the price of the haltech ecu, and tuning it should put your at around a solid $2800-$3500....vpc, yes, it works, but i cant justify the cost instead of getting a 3.5 inch Z06 mass air with translator for $350, when you will spend over $1000 in a vpc/gcc or s-afc, use your head. ..microtech...ya, keith is getting one...now try using your head for a second, for a street car, what makes more sense, spending over $3000 on tuning equipment, or $400, and $2600 in toys....as far as the "fastest cars in the world use speed density" goes....., thats not even worth the keystrokes