Most of your list is solid, but first, I’d recommend you stop and think about what you want for the overall build of the car rather than just throwing parts at it and hoping they stick. Is this a daily driver, canyon carver, or are you thinking of occasional track/autocross events (or more serious)? Do you have a certain look in mind, or do you like the car as is but just want something a bit OEM+?
How many miles on the car? Seems like you’re missing shocks to go with your springs especially if yours have >50k miles on them
(By the way which Whoosh kit are you seeing for $300?)
- Bilstein B6’s or B8’s are a good choice. Koni also makes quality stuff.
If you’re after outright performance rather than just looks, I’d avoid springs that drop the car more than an inch. Ideally less. Swift is a popular option, or if you want no lowering at all, I cooked up an off the shelf custom setup that’s about the same price as the swifts:
https://www.fiestastforum.com/threa...ce-springs-for-oem-b6-style-suspension.30829/
Alternately, you can stick with the stock springs which are actually pretty decently tuned. They are basically already “Ford Performance” lowering springs on a Fiesta and most lowering springs (except the Swifts) either don’t change the spring rates meaningfully or are in some cases softer since they were designed for the base Fiesta. In that case you can just go with the shocks only.
For sway bar, I’d recommend just starting with a torsion beam brace (Pierce, etc) which is a bit milder than many of the thicker rear bars. All are easy swaps and you can switch out for a stiffer rear bar or add one on if you want more
If you’re doing any power upgrades (intercooler+tune), an upgraded rear motor mount and front subframe brace (2-point or 4-point) should make it on your list.
Regarding tunes, on the stock turbo, many of the flash tunes (Dizzy, Stratified, Tune+, etc) out there are have been refined pretty well, and you won’t gain much, if anything with a “custom” tune. Not familiar with Panda, but an intercooler and a Stage 2 flash tune will get you most of what there is to get short of upgrading the turbo. Basically especially for a mild/stock turbo build, stick with a flash tune and save your money for other stuff. Custom tune is really only worthwhile for a hybrid or other turbo upgrade.