This is my H22A exhaust setup: 1) HKS Hiper (improve low end torque.. got power from 2000RPM till 8000RPM Redline. very nice flow of pickup n top speed (bit loud la,inside can hear,very noisy like bee sound,really annoying,when VTEC hits feels like the engine wanna BLOW ok?. very nice!!!!) 2) Mugen Twin Loop ( as im using b4,err low end torque ok la,but in the middle section of RPM,b4 VTEC hits,it loose some power,then after VTEC open till REDLINE 8000RPM,its OK,err bout sound? i had a PUSSY CAT sound,meoooWWWwwww meWOoooo even slow when VTEC open. (not noisy,looks stock,with single ugly tip) 3) HKS Super Dragger (this is my top secret weapon,it looks just like a damn big tip,slow sound but really BassY (i love bassy sound like turbo exhaust system) broopp broopp broopp brooop,errr.. low end torque bit bad.. but then till 8000rpM REDLINE is the best. when driving normal or hard,the exhaust wont make noise at all,but when u hit VTEC,u will hear monster came out from the exhaust. very big tip.. inlet 2.25-2.5inch .. outlet 5inch.. actually i do like quite exhaust. but when u hit VTEC it will scream like hell!! hell yeahh!!!.. as u all can see.. all my setup is using Straight flow exhaust. except for Mugen. i never tried S-Flow exhaust on my H22A. heard some say auto must use S-flow. n manual must use Straight Flow. but seems all i can see.. auto use straight flow,manual use s-flow. bump1!!