Just replaced my former stock 2" exhaust system with Dynamax muffler with an MSA Premium exhaust for stock manifold system:
Motorsport! MSA Premium Exhaust System, 70-72, 74 240Z-260Z (For Stock Manifold) - The Z Store! Nissan-Datsun 240Z 260Z 280Z 280ZX 300ZX ( Z31 Z32 ) 350Z 370Z Parts
anyway after installing it i am noticing a loud deceleration pop at the exhaust which i didnt had with the former exhaust system. so i tightened the tailpipe rear and front clamps as there is no gasket in that área. the only 3 gaskets that come with this exhaust system are the manifold to downpipe gasket and the two pipe to pipe 2.5 inches gasket. I even lowered the mixture to 1.5 turns clockwise to lean the mixture and there is still popping at the exhaust. Any clues? My BTDC timing is set to 16 BTDC and My camshaft is a Schneider 274F.
Just to confirm i had no backfire with the former Steel stock exhaust. What could be causing this?