OP leave the Stillen kit alone you will modify the kit to even try to get 500whp. Trust me I tried made 465 whp dynojet there hasn't been anyone that made more. There are so many things that are wrong with the kit it's not worth your motor I hurt my stock motor doing so.
If cost is your main factor and you want 500whp I would look at these kits in this order.
1.Boosted performance mid mount single turbo
2. GTM supercharger kit
3. GTM TT kit.
From reading your post option 1 and 2 seem to be more cost effective for you.
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Driven Motorsports Single Turbo 7675 T4 1.32 A/R 995WHP 780TQ
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