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Message: <blockquote data-quote="gregbar" data-source="post: 809053" data-attributes="member: 12608"><p>I have MAC long tubes on now. Ive had shorties also. Longtubes move the O2 sensor further away from the engine and the HEGO Delay in the EEC must be changed. When I went with shorties every thing was fine. Longtubes not so fine had idle issues. Also my MACs have individual flanges for each primary they all shift or move so installing takes some pulling pushing etc. My exhaust MAC longtubers ceramic coated, MAC pro chamber and Dynomax cat back and no cats. Sound is like late 60s early 70s muscle car.  Not as loud as 2 chamber Flowmaster. I also have no resonating that some have.</p></blockquote><p></p>