Auggie! what are the "other things"? My next big thing is Mike's front frame stiffener. Got my pennies all saved up.
Intake and exhaust work together if you are trying to improve performance you need to do both. More air in and more exhaust out. By simply opening both up and doing a super tune you can pick up around 50 horsepower without tampering with the motor and changing it's reliability. Need to figure out why you are doing things and then do them.
Not expensive things folks can do and gain over 50 horsepower and gobs of off the line torque.
Had my Throttle Body done by Faster Proms in Florida, Jeremy tune. Took it off myself and sent it UPS. They did it and returned it very promptly. They shaved off all the edges inside and took as much material off as possible to enlarge the opening to match the intake. Very responsive and much faster off the line. I also did the Taylor Helix throttle body spacer, K&N cold air package, Jet High Performance Mass Air Flo Sensor, true dual exhaust, and super dyno tune. The whole thing is like night and day.
On the Dyno it read 362 horsepower and 369 torque at the rear wheels after the work he and I did. He used some kind of fancy formula and figured 452.5 horsepower and 461.25 torque at the crank. Pretty good increase from stock plus very smooth and more responsive. Reset cooling fans, shift points and firmness and overall adjusted everything. This was all done after the K&N Cold air package, the throttle body port and polish done by Faster Proms in Florida, the Taylor Helix throttle body spacer, the Jet high performance mass air flo sensor, and the Magnaflow true duals exhaust. Split the header pipe and am running two pipes into the special muffler and two pipes out. There is an X pipe in the muffler.
Got all the stuff from Auto Anything. K&N Cold air package is $433 and makes a world of difference in sound and low end torque.