DONT do resonator delete!!
09-26-2010, 12:18 PM
#12
so how is it set up considering there is a single pipe back from the cats---resontor and then another single pipe. What is your exact setup if you dont mind me asking.
Dual 2.25 is probably still way to restrictive for a 330hp v8. You should have done 2.5 Dual
Dual 2.25 is probably still way to restrictive for a 330hp v8. You should have done 2.5 Dual
09-26-2010, 01:21 PM
#13
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My Ride: 525i
Model Year: 2007
man my friend got the 335i convertible and sht the sound is just amazing, deep but not too loud, i would love do mine to get the same sound as his man, any recommend ?
09-26-2010, 07:49 PM
#14
09-26-2010, 09:47 PM
#16
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My Ride: 2005 BMW 545i, Silver Grey, Sport Package, R. Shades, Cold Pkg, Sat. Rad., Prem. Sound.
So i will be the first to eat my own Shit and will take back my comments on loving my resonator delete. Over the last 2 weeks it consistently got worse and worse-- a terrible low awful drone and all speeds, with burbling on deceleration when the revs dropped, sounded so civicish it was awful and gave me a headache driving.
The worst part the performance of the car went to hell. The engine (n52 and most bimmers non FI) are designed for high RPM performance, well I deleted the resonator and put 2.5inch piping and it was too small I believe as my top end performance was just dead after 5500--where normally it is the strongest.
I went and got my resonator put back on. It was not just the resonator but I had gotten a y pipe to connect right after the cats and put 2.5 inch single pipe all the way to the RPi muffler. SO a long stretch of 2.5 inch single pipe--had all bad attributes.
With the resonator back on and just the RPI exhaust it sonds soooooo quiet in a good way with the normal RPI growl only when you get on it, instead of a annoying drone at all speeds.
Resonators are there for a reason I hate to admit. They are designed in odd shapes for a reason. Unlike mufflers, resonators are hemoltz resonators and actually have a function on exhaust gas expulsion and sound unlike a muffler which is not a hemol. resonator. The resonator is an open baffled chamber of varying shape and design-specific for each engine configuration. So to take it off is messing with something they specifically designed for that engine, in that part of the exhaust to properly control exhaust gas velocity etc.
Car is much more performance with it back on. I was a non-believer in a resonator delete could possibly effect performance-but i was wrong! NEVER do this.
150 bucks later (100 for the delete and 50 to put it back on ) I learend my lesson!
The worst part the performance of the car went to hell. The engine (n52 and most bimmers non FI) are designed for high RPM performance, well I deleted the resonator and put 2.5inch piping and it was too small I believe as my top end performance was just dead after 5500--where normally it is the strongest.
I went and got my resonator put back on. It was not just the resonator but I had gotten a y pipe to connect right after the cats and put 2.5 inch single pipe all the way to the RPi muffler. SO a long stretch of 2.5 inch single pipe--had all bad attributes.
With the resonator back on and just the RPI exhaust it sonds soooooo quiet in a good way with the normal RPI growl only when you get on it, instead of a annoying drone at all speeds.
Resonators are there for a reason I hate to admit. They are designed in odd shapes for a reason. Unlike mufflers, resonators are hemoltz resonators and actually have a function on exhaust gas expulsion and sound unlike a muffler which is not a hemol. resonator. The resonator is an open baffled chamber of varying shape and design-specific for each engine configuration. So to take it off is messing with something they specifically designed for that engine, in that part of the exhaust to properly control exhaust gas velocity etc.
Car is much more performance with it back on. I was a non-believer in a resonator delete could possibly effect performance-but i was wrong! NEVER do this.
150 bucks later (100 for the delete and 50 to put it back on ) I learend my lesson!
You are right, the resonators are made to reduce the droning at certain speeds. BMW further used the muffler vacuum valve so that the second muffler only open up at WOT.
Sorry, I wasn't there to tell you.
09-26-2010, 10:40 PM
#17
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hmm i took out one of the resonators on my 645 still have one in. then a custom X-pipe and magnaflow exhaust. no droning at all and i think it's the best exhaust sound i've heard on an E6x.. not too loud but noticable when you want it to be and a nice low bassy roar
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