brullen also makes equal length headers.
it's discountinued but used ones can be found in 400-500 range with a hi-flow cat depends on condition.
for the cobb intake used one cost from 150-200, it would be a STEAL to found a used cobb for 100.
for EM there's also e-manage (or something like that?)
also another common small stuff for power is upgraded spark plug and wire (ie, magnecore)