Someone I trust very much in the field says this is not the case at all (@tadda), what sort of issues did you come across yourself? Frequency response, air movement, etc? With the EQ dialed in, and the "Tadda Mods" the subs sound quite nice and responsive.
What did you go with? What were the...
Depends on power. Lots of high HP guys need them. When the drive shaft breaks (you need a drive shaft loop, too), well.. it sits right below the fuel tank.
This is really bizarre to me.
So, for injectors. The Supra has six, you're adding six more via the Manifold, this is port injection. So you'll definitely need to control them somehow. You can't just add six more injectors and expect them to do anything. I'm hoping they ordered you a Reflex and...
I'd throw this thought out the window. Once you're making enough power where you need to add additional injectors (and good lord, 700hp is your target, right?), this thing becomes an absolute money pit.
Also, you can easily get to 700hp without that $4k manifold, you can do it with just port...
oof.
While I understand your concern here, there is really nothing to worry about. This is.. obnoxious. It's an oil change. There are no gotchas on changing the filter or anything else.
If you're that concerned, Grab some LiquiMoly 5w-30 and do it yourself.