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You can do the mods in my signature, you will pass a stock 04 ss easily.
3.69 gears are expensive though. But even without the gears the rest of the mods would be even with a ss
 
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The only mod you listed that will increase hp by a good amount is rockers.

Make your own intake then zzp plog,zzp 3" downpipe,zzp hv3, zzp er rockers, overkill tune, those mods are the one you want, if you don't want all those tell me your budget and I'll tell you best bang for buck.

Catbacks won't increase hp for our cars, intakes maybe 3hp so make your own,throttle body isn't worth buying new either
 

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