I think the performance is overall pretty good except I think you LOSE torque if you install the header. I think my car accelerated faster with the stock manifold. It kind of pisses me off. The sound is good though. I have the ebay header, high-flow cat (opened piping), aeroturbine resonator and aeroturbine muffler (both are bottle-neck shaped). It sounds mean all the way through the rpm range and is pretty deep too.
At one point before the performance resonator, I did have the stock toyota reso on and it sounded muffled and so I installed a straight pipe in place of it and it sounded horrible in the upper rpms. Now I have what I said earlier with the Aeroturbine resonator and it's perfect (except for the loss of the quick throwback you get with a stock manifold when you punch it).
At one point before the performance resonator, I did have the stock toyota reso on and it sounded muffled and so I installed a straight pipe in place of it and it sounded horrible in the upper rpms. Now I have what I said earlier with the Aeroturbine resonator and it's perfect (except for the loss of the quick throwback you get with a stock manifold when you punch it).





