Id assume the exhaust also. Believe it or not, there is such thing as too little back pressure. I see you have test pipes and that with the LTH and custom exhaust (depending on bends and how truly straight through it is), you've basically a forced induction exhaust setup on an NA car. I bet goin back to HFC's you would probably get that pull all the way through. Post pics of your dyno sheet if you have it.
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