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They are bolt on only if you have your stock headers. If you have shortie headers that had to be welding on then you would have to weld the solo high flow cats on as well. Also, I had my DT shortie headers put on before adding solo high flow cats. Did not really notice a big difference in power from shortie headers compared to my stock headers. Then i put on the solo high flow cats and the power gain was unbelievable.
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ADM LSA Supercharger Conversion, ADM air intake ,Stainless power 1 7/8 long tubes w/hi-flow cats, Chunnningham Motorsports stage 2 cam and custom Dyno tune from Starkweather Performance.
624 RWHP, 524 RWTQ
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