Opinions and assistance: JBA Shortie headers install on 2013 DC 4.0l tacoma 4x4

hello yall. want to see if anyone can help me or point me in the right direction. opinions welcome too. planning to buy the JBA Part #:2035S-3JT shortie headers that are CARB legal for me here in san diego CA.
1st: how hard are these to install. i am mechanically capable but wanting opinions or help from someone that has done this job.
2nd: is this a good upgrade for this truck?

thanks

 

little better performance, maybe some better torque. i know im not gonna get dramatic change such as a supercharger would offer, but maybe free some hp/tq up. my last vehicle was a 2000 t4r 4x4 fully built with trd supercharger and urd goodies. that worked well. im new to the tacomas with the 4.0. any suggestions?
also one thing that bugs the shat out of me is the noisy engine or tick it makes under a small load or idling when warm which ive read is "Normal".

 

You will have to cut the cats off of the exhaust manifold and weld them to the new headers. Did it to mine, but dropped $200 to have them tig welded.

 

not concerned with that, i have connects for that to get the tig welding done for free. but is the work worth it and is it very hard to do the job?