So looking into upgrades and modification for my 98 540i. My entire exhaust system needs to be replaced minus the headers. So I would like either a smart answer or something from personal experience.
For the catalytic converter should I stay with single dual like stock, or just go with one with either 2 in & 2 out or 2-1?
Kissing the "Y" resonators goodbye and going Dual Exhaust.
Any ideas would be nice. If you have a type or brand in mind, please share.
Thanks. Full Exhaust System.jpeg
Gonna be loud without the resonator.
If you have to pass emissions you should keep the 2 OE CAT's. They are probably bigger and have less restriction that what you would use to replace them, unless you are going to use some pricey 100 cell CAT's.
I have dual on my car, big pain in the ass getting two mufflers in thanks to the battery.
1997 540 / 6 Sport, 2001 540 staggered rims
Suspension = Bilstein B8 Performance Plus Struts, Xeon headlights & fog lights, LED tail lights, Evo short shifter, Custom air engine intake, 3 inch dual exhaust hollow cats,NGK iridium spark plugs, removed -clutch delay valve
Removed them, i rewired my 02 to pass with 02 simulator. If you just go with stock muffler remove resonator car sounds awesome.
Last edited by Franktea; 09-01-2017 at 12:26 PM.
1997 540 / 6 Sport, 2001 540 staggered rims
Suspension = Bilstein B8 Performance Plus Struts, Xeon headlights & fog lights, LED tail lights, Evo short shifter, Custom air engine intake, 3 inch dual exhaust hollow cats,NGK iridium spark plugs, removed -clutch delay valve
ill upload a video of my set up later today but my set up is catless headers true duel exhaust 2.5 inch stainless straight piping to the y now on the y section i dont have the factory resonator but have have a after market resonators on eon each pipe leading to the y section. Then from there i have it going to single muffler with akraprovic carbon tips
540i 6spd DUDMD tuned-weekend brute, sounds like an M5 throaty V8 "Vtec-ish" cam noise.
Hummer- 35inch MT's, Adventure offroad package.
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Best Oil hands down for bmw
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Your butt dyno will notice a great increase in power, due to the noise.
Magnaflow makes good quality high-flow cats, model-specific.
If you do go with duals, be sure to include an X-pipe.
Last edited by edjack; 09-01-2017 at 01:37 PM.
Ed in San Jose '97 540i 6 speed aspensilber over aubergine leather. Build date 3/97. Golden Gate Chapter BMW CCA Nr 62319.
I edited my post to include "model-specific."
Ed in San Jose '97 540i 6 speed aspensilber over aubergine leather. Build date 3/97. Golden Gate Chapter BMW CCA Nr 62319.
Cool guess I'll just get everything maganflow make it easy
One day i was in Manhattan and the cats were so clogged i could even run the motor, I pulled the 02 sensors out before the cats just to have enough exhaust flow to get home. Long story short i bet i have more HP than stock, all restrictions gone, A CAT is like trying to take a poop through a cheese grater.
1997 540 / 6 Sport, 2001 540 staggered rims
Suspension = Bilstein B8 Performance Plus Struts, Xeon headlights & fog lights, LED tail lights, Evo short shifter, Custom air engine intake, 3 inch dual exhaust hollow cats,NGK iridium spark plugs, removed -clutch delay valve
Yeah but I live in TX we still require emissions.
Thats why you get the 02 sims
1997 540 / 6 Sport, 2001 540 staggered rims
Suspension = Bilstein B8 Performance Plus Struts, Xeon headlights & fog lights, LED tail lights, Evo short shifter, Custom air engine intake, 3 inch dual exhaust hollow cats,NGK iridium spark plugs, removed -clutch delay valve
I'm already taking the resonators off and putting X-Pipe, going to try dual Mufflers, that's going to be extra loud. I might just keep the CAT's
The mufflers you choose will be very important, i would listen online at other on You Tube could sound really bad depending on setup.
1997 540 / 6 Sport, 2001 540 staggered rims
Suspension = Bilstein B8 Performance Plus Struts, Xeon headlights & fog lights, LED tail lights, Evo short shifter, Custom air engine intake, 3 inch dual exhaust hollow cats,NGK iridium spark plugs, removed -clutch delay valve
Well it's done, sounds beautiful. Not loud at all, even with the resonator delete.
Looks Good,
Going to do mine in the near future. Just a Catback setup. Leaning towards a Billy Boat or the cheap route with a TopSpeed Pro-1 and possibly a Vibrant bottle resonator to replace the stock Y-res.
1998 540A M62 Black/Black Style 37's Dynavin N6 (SOLD)
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