petemac Posted March 18, 2012 Share Posted March 18, 2012 "12.6 Exhaust System a) Replacement of stock Catalytic Converter system is permitted. b) Replacement of OEM exhaust system is permitted and unrestricted providing it exists aft of the rear sub-frame. NISMO Cat-back system is also permitted. c) Stock exhaust heat shielding may be removed." Does this mean we must run cats? but we can run straight pipes following the cats provided they exit at the rear of the car? or can we remove the cats and run straight pipes? Quote Link to comment Share on other sites More sharing options...
dkmura Posted March 19, 2012 Share Posted March 19, 2012 "12.6 Exhaust Systema) Replacement of stock Catalytic Converter system is permitted. b) Replacement of OEM exhaust system is permitted and unrestricted providing it exists aft of the rear sub-frame. NISMO Cat-back system is also permitted. c) Stock exhaust heat shielding may be removed." Does this mean we must run cats? but we can run straight pipes following the cats provided they exit at the rear of the car? or can we remove the cats and run straight pipes? The rules are clear: you may remove the cats and run straight pipes if you wish. But for those that don't want to modify their Zs that far, they may retain their cats or run the NISMO catback (or another brand) exhaust and still be within the rules. Quote Link to comment Share on other sites More sharing options...
Cobra4B Posted March 19, 2012 Share Posted March 19, 2012 You jumping ship on ST2? Quote Link to comment Share on other sites More sharing options...
n80 Posted March 20, 2012 Share Posted March 20, 2012 The rules are clear: But not crystal clear. They say you can replace the stock CC but they don't say with what. Quote Link to comment Share on other sites More sharing options...
National Staff Jeremy C. Posted May 2, 2012 National Staff Share Posted May 2, 2012 The rules are clear: But not crystal clear. They say you can replace the stock CC but they don't say with what. I will make note of that in the next version of the rules! Thanks for the catch. The intent was to allow straight pipes to replace the cats if you wanted. Quote Link to comment Share on other sites More sharing options...
dmdirks Posted June 3, 2012 Share Posted June 3, 2012 OK- another clarification about 12.6.b, "Replacement of OEM exhaust system is permitted and unrestricted..." Does this mean headers are legal, or are the factory exhaust manifolds required? Thanks! Quote Link to comment Share on other sites More sharing options...
paulwalshnissan Posted June 5, 2012 Share Posted June 5, 2012 i read it as stock manifolds, no headers Quote Link to comment Share on other sites More sharing options...
WacoRacer Posted June 5, 2012 Share Posted June 5, 2012 OK- another clarification about 12.6.b, "Replacement of OEM exhaust system is permitted and unrestricted..." Does this mean headers are legal, or are the factory exhaust manifolds required? Thanks! Factory exhaust manifolds are required. That will be corrected in the next rules revision. If there's not a revision out by Nationals then a Tech Bulletin will be issued. Quote Link to comment Share on other sites More sharing options...
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