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So my header size choice is not ideal I gather. Unfortunately it is made specifically for LS swaps into Jeeps and is part of a entirely bolt in exhaust system and my previous exhaust setups had interference issues with the front drive shaft. I will say my first exhaust was 1-5/8 primaries with 2in dual into a 2.25 single, when I went to the new header back exhaust with dual 2.5in to 3in single and different but CHEAP 1-5/8 headers, that really did improve efficiency by 10% and the new 1-3/4 headers with same as the previous exhaust system just dropped me back. So instead of changing the headers, can I add a restriction further up the system, or does it not work like that?
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