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Hi all, I'm looking to replace my stock exhaust manifold with a header and I'm leaning towards Dynomax Blackjack Headers and I'm wondering if it would be a good match for my 90 YJ

Hi all, Has anyone had any experience with ATK engines? http://high-performance-engines.com/Merchant2/merchant.mvc?Screen=PROD&Store_Code=ATK&Product_Code=HP25 I'm ready to replace or rebuild the stock 6 cylinder that's in my 1990 Jeep YJ. Any suggestions? Thank you