Well, it's certainly not impossible to make more than 300 hp to the wheels with only 1 5/8 primaries, but the optimal header will depend on your car and engine setup.
I have a set of Hooker long tubes with 1 3/4" primaries and 3" collectors for sale if you are interested....
- Justin
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1999 Camry - Beigemobile DD
2002 Suburban - Wife's DD
2004 Grand Cherokee - Not running / Project / Selling?
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