all i did was down shift coming to a light was on 2nd at about 2500 3k then i had clutch held down rev a lil bit and it then back fired i have been told this is bad but i love that sht i dont have much done power wise speed manifold/headers full exhaust system cat back and all upgraded turbo small one only goes to 9psi hks bov and intercooler thats it its like 190hp.