I'm looking at PWMing a brushed motor so wanted something to take the edges aff the transitions. i was going to do a pi filter.
You are doing it wrong. A motor controller doesn't need an inductor - the motor is the inductor, and a massive one.
There are special cases such as air-core micromotors which have so little inductance that you add external L to allow not-over-the-top PWM frequency while maintaining low ripple current, but I bet this is not the case.
Your motor likely is a 10 or 100 times larger inductor (often measured in millihenries), so adding a 33uH in series is meaningless for ripple current. If your concern is EMI from brush noise and/or PWM edge rates, it's way too big.
If you are looking for EMI suppression (from brush noise), you do it with small ceramic capacitors (two in series, from line to line, center tap to the motor case), and if this is not enough, by adding a common mode choke, after which you can add another capacitor. Note that this is really high frequency noise, so it's dealt with small magnetics and small capacitors, it doesn't need to store a lot of energy, the motor inductance does that for you.