Just did complete tuneup etc. on my newly purchased 90 Coupe. Looks and runs super, now for more power!! I read in my fuel injection manual that this is a speed density system rather than mass air which means the computer can't compensate for better breathing etc. Any one have any suggestions on what my best course of action on the L98 is? I thought about a valve grind/port job, exhaust system, and 1.6 roller rockers. What do I need to do to make these impact the power?