Recently had the exhaust changed on my 180SX and wondering whether I should have the tune looked at and retouched if needed to be on the safe side, given the increased diameter. Cautious as the car mainly gets tracked and is running near max injector duty cycle.
1.5JZ running 24psi on e85
Old setup: 4' dump and front pipe to 3' cat back (no cat) single cannon muffler
New: 4' dump into 3.5' from dump (no cat) and single straight through muffler
Cars running haltech boost control and wideband O2 trimming
Edited by 1.5J 180, 04 February 2017 - 09:21 AM.