Quote Originally Posted by d j View Post
+1
...also, what are you after anyways? just the exhaust tone or are you trying to free up some horses? if all your concerned about is the tone, just eliminate the resonator and let your muffler do the screaming. but if your looking into performance... I would suggest doing a tubular SS header (4-2-1/4-1) + high flow cat + catback (in your case, straight pipe). as far as the pipe size, pick the appropraite one, bigger doesn't always mean better, (assuming that you have a 4 banger) if you have a 1.6 with some bolt on mods:2.25" dia.; modified 2.0/heavily modded 1.6: 2.5" dia.; turbo: 3" dia. also if your going to do a custom piping and using a crush bender, try to minimize the bends as much as possible. if you have to form a horse shoe, try to do it using pie cuts instead of bending.
and regarding the header design, 4-2-1 is mainly designed to gain torque and the 4-1 is for top end gains.
ask ko lang yung case ko. 98 civic lxi auto ko. kinabitan ko ng fujitsubo legalis na chambered muffler. after ikabit napansin ko na lumakas yung hatak. pero medyo gusto ko pa palakasin yung tunog. may nagsabi saken na patanggal ko daw yung resonator na katapat ng handbrake. yun yung mataba. dalawa kasi yun sabi nung nagtatanggal. may isa pa na mas manipis nauuna dun sa mataba. ang tinanggal ko yung mataba pinalitan lang ng pipe. lumakas yung muffler. ganda nga ng tunog actually e. pero napansin kong nawala yung hatak na na-gain ko before tanggalin yung reso. parang bumalik sa stock yung hatak lalo na pag uphill ang takbo. im planning to re-install my resonator. or kung ipatanggal ko nalang yung isa pang resonator? ano magiging effect nun? or ipabalik ko yung matabang reso at patanggal ko yung maliit na reso? ano naman effect nun? suggestions naman mga sir kasi ang gastos ng trial and error at putol ng putol ng pipes e. salamat and more power to you guys..