4-1 tested with S-flow muffler Vs Straight-flow HKS

Note:
The left 'round' unit is HKS Straight flow.
The right Oval unit is Replica Mugen S-flow.

The combination:
1) Original 4-2-1 with S-flow ~ 9.4km/l.
2) Replica 4-1 with Straight flow ~ 6 km/l.
3) Replica 4-1 with S-flow ~ (Collecting Data)




























I tested the 4-1 combination with the S-flow muffler versus the Straight-flow HKS muffler.
I found the S-flow muffler is better at town driving and better FC compared to the straight-flow HKS. The power and torque for (4-1 + HKS) only starts at 4k RPM onwards and climbs like crazy for VTEC. VTEC revs feels like limitless. Below 4k RPM is different story, loss of torque and power causes the car to feel so sluggish and FC to drive it in town is NUTS....more than RM0.28 per KM.
I changed back to the S-flow, right after the exhaust pipe cooled down.
I will still be keeping the Straight flow HKS for occasional needs..... hahahha (If you know what i mean).