I have been asked on what is needed for to fit an IFS front end to a streetjam, so here is what's needed. I Suppose this will work with SP1 as well.
Other then the Exotek IFS front end and adjustable upper arms you will need
Tamiya Steering uprights #54357 (alloy) or #54154 (carbon)
Tamiya 104 Kingpin #57160
Now you will either need some long Tamiya 5mm Ballstuds, or you can do what I did and use Associated\Yokomo sized smaller ones with matching Yokomo rod ends that match the Streetjam. You will also need lots of shims in different sizes to get the ride height correct.
Lastly you will need some sticky stuff for the dampers, if you use the Exotek ones, I will be doing some testing this Friday with the recommended Tamiya AW grease, plus some 200K oil, I have already tried 100K but was way too thin and wasn't really doing any dampening.
To control droop I just had some lock nuts that do the job but the bigger you have the better.
Beth.