just re-thinking my cars exhaust and contemplating this:
after market headers (equal length) ===> full decats ===> after market Y pipe (?? NISMO) ===> single pipe (to tip) containing ONE 100 cell cat +/- a silencer.
from Y pipe to tip fixed diameter (3").
1. will this pass an MOT?
2. is this a near perfect exhaust setup for a 350z (N/A)?
3. what sort of gains could I expect after a remap?
4. am I right in assuming I would need to reposition the O2 sensors +/- antif's?
advice much appreciated