Which gaskets are they charging you $31.16 for? The kit comes with all the gaskets and you definitely want to use the ones that come with the kit as they are the best header gaskets on the market.
What are the header bolts for? Again, new ones come with the kit
Only $23 for eight spark plugs? Are these the same as the factory Platinum 100K mile plugs? My suggestion is to only use exact factory plugs. I have been doing this far too long and have learned many lessons over the years, to always use exact same as factory plugs. Something tells me for that price, they are not the factory spec plugs but I could be wrong....
Typically, a dyno tune is a good idea when installing long tube headers. However, a quick call to Dynatech will tell you that these are bolt-in headers and will work great with OEM PCM. The kit comes with all the necessary cables to make this a bolt-in job. Usually with Long tubes, you will want to add delay in the AFR metering because the O2 sensor is further back on the exhaust manifold, but Dynatech is convinced their kit does not require custom tuning. However, a custom tune will benefit even a stock vehicle. I guess we can consider the tune "over and above" what is required for this install, but will certainly add positive improvements
I have a custom tune for my headers and I have ran the vehicle with and without it. Honestly, I cant tell the difference. The only difference in both maps is one is for the LTs and the other is not. If you already have a handheld tuner, you might not see much improvement.
Also, I hope their dyno is made for full-time-4WD vehicles - most are NOT.
