i have a jdm d15b2. when i have my stock headers, it doesnt allow me to go over red line. it falls back down at 6000rpm. when i got dc hearders, it allows me to go over but i only tryed to 7000rpm cause im scare the engine might blown on me. what do you guys thing. how far can it really take?

 

On most d-series motors the power falls off at 6800, so theres no reason to go any farther than that anyway