I cant believe the results!! So much power difference. Cool part is you get 3 springs in this pack. Use the one you want and sell the other 2 to your 7.3 friends & family. These springs will not disappoint!!

This is one of many parts I have ordered from Riffraff. All there parts are way above the competition. Instruction manuals are spot on.

Purchased this kit to replace OEM spring, Used Black spring to achieve a little higher fuel rate. Seems to smooth out the injectors, for a smoother ride. Nice kit.

Put the 70 psi spring in and was very happy with the results keep my fuel psi above 60 when full throttle with stage 2 injectors.

Went with the middle of the road spring. Great throttle response. Sounds smoother at idle.

Great part fantastic customer service. I will be continuing to reccomend yor company!

Works as it should, checked every spring fuel psi, right on the money

I have just installed the gold spring not long after the oil crossover pipe it has made it run slightly smoother again and quieter again on the hwy. Slightly more power and has smoothed the engine out right through the rev range . Even noticed less cackle another awesome product from riffraff.

I used the gold spring and it works good. Honestly can't tell much of a difference in power. Idle is a little smoother. Spring is definitely a little longer than the original I took out but went back really easy.
Mines stock other than
TS6 position chip
6637 intake
Wicked wheel 2
4 inch turbo back exhaust
Oil crossover