Major gain from the tune is throttle mapping and maybe some improvement to the general power curve. I thought standalone is was the most significant engine upgrade, as far as sensations got. Peak power only goes so far, and hardly translates into anything more sensational after this point. Would probably just count more for a track build, if lap times and the pace had a real purpose.
I think exhaust and tune is enough before you go down the rabbit hole of extra spending. You have the sound you probably want, and then a better map. If you're super protective of CARB, you maybe don't want to do the tune at all.
So +1 on suspension/chassis work. If you wanted more power it's either boost or a different car altogether.
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