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The aneroid (smoke puff limiter) is not needed, all it does is limit fuel delivery till turbo spools up - ya know how big trucks blow dark smoke for a few seconds immediately after an upshift, that's the kinda smoke-puff you'll be limiting, certainly a nice feature to have but not really needed for your purposes (it's basically a want vs. need thing, and you don't "need" the aneroid). Big exhaust is nice to have and certainly has a benefit in the power gained department, so I suggest that you keep that. Pyro and boost gauges are a must, so those are keepers. The cold-air intake will also help you out good, but at $425 for the kit personally I would come up with something on my own...
As to how much to pay and who to hire for the job - it's all fairly easy work altho since you obviously don't feel comfortable doing it yourself I'd suggest that you hire a mechanic whom you have worked with before and whom you can trust - being a mechanic myself I always try to be honest with my customers and sometimes that means admitting I do not feel comfortable with a certain job and recommending them a different shop/mechanic for it, so if you have a guy who tries to maintain similar professional values then he is the person to talk to.
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