PEARL JAM

I've done some go-fast upgrades so far. Headers, CAI, ported the throttle body, ect. But so far the only suspension upgrades i've done is rear drag bags (so-so in effectiveness) and 18in wheels.
What is the best "bang for your buck" Suspension upgrade(s) available for street applications? (I'm not looking to spend thousands, if possable)

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2004, .588 lift cam, slp LT's, ported/polished MAF case&throttle body, CAI, Flowmaster Deltas, B&M shortthrow, dragbags, HP Tuners tuned.

 

Verdoro 68

At minimum - radius rod bushings, differential insert and rear cross member mounts. Should set you back around $375-$450 depending on the bushing manufacturer you choose. The next step would be strut mounts, but you won't see much performance benefit from them - just evenly worn tires

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2004 GTO Pulse Red A4
1968 GTO Verdoro Green 400/TH400/3.55 posi

My strut rub story and Pedders upgrade solution