straight pipe
And I think that you might benefit more from just headers and a decent catback or true duals with them. Stock manifolds will suppress power. Unless you are staying that way for emissions reasons.
IMO what you should do is wait until you can afford headers (since you said you plan on adding them anyway) and do it right all at once. If you're hell bent on having a dual setup off the stock manifolds, your best bet is to take these "pipes" you have to a competent shop and have them build a system for you. That's really the only way you're going to be happy with the results.
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