hey i did this on my 33gtst and its poping and crap well by the way its a S1 4 speed auto , 600x300x75 intercooler and a 3.5inch stainless from cat back and i did this thing by cut the black wire and the black wire onto the car body and the black wire from the computer taped to block it . now took it up the street and it will get to 5 psi then it will just back fire and pop and jump or what ever eles .. then i put it all back to normal then it was fine . i wanted to do this thing , but can anyone tell me how to solve this problem . or anyone from lismore or ballina . cheers, adam