i think it should be around 2.3, normal for 20v.
upah pasang depends on how much of mod it would need. If it is based on Levin/Trueno AE101 or AE111, It may need some mounting mod at the rear muffler. And since u are gonna throw away ur cat, u'd need a part of 2.3 pipe as replacement. Rm80 is a bit steep. I did mine for rm30. Maybe u can ask for discount.
my car is trueno ae101,the exhaust+piping just plug and play,ya,need some mounting mod at the rear muffler cause my ori is twin muffler...and + exhaust gasket....RM 30 ??where u install it?can let me know???cause i haven install it...
i check with some shop,the cheapest is RM 80,some quote me RM 150 for this plug and play exhaust....100% no need welding...so expensive...