Yes welcome to the forum. There is plenty of good advice and education to be found here. Folks here have helped me with mod and DIY advice.
IMO most cost effective thing is a tune (I did the AA tune) and an airbox charcoal delete.
Don't have experience with the 3 stage manifold, but those who've done it claim to be happy with it. Doesn't fit my budget for now.
I would be reluctant to supercharge my car. Cost and compatibility with drive-train would be big concerns for me. Think you would be better off with the other suggestions made here.
Suspension upgrades are economical, particularly if you wait for your stock parts to wear out before upgrading.
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