Secondary Kitties + Resonator Delete :D
11-25-2009, 02:34 PM
#51
YESSIIRR! when i had my Z for smog check i was really nervous because of my exhuast system...the Z's exhaust is loud! but not steroids loud..its loud enough to be heard...
lets just say when the guy revved up my car in the lil room that the take the car in for smog check...the cars exhaust sound rumbled throughout the room..made the senior citizens that was waiting in the room with me kringe and look at my car hehehe
lets just say when the guy revved up my car in the lil room that the take the car in for smog check...the cars exhaust sound rumbled throughout the room..made the senior citizens that was waiting in the room with me kringe and look at my car hehehe
Andy
11-26-2009, 04:31 PM
#52
MBWorld Fanatic!
but if u think about it, people go for race cats coz they want less restriction..louder exhaust not, yet will still pass smog?
btw HAPPY TURKEY DAY EVERYONE! MERCEDES BENZ RULE!!!
Last edited by SGTzAMG; 11-26-2009 at 04:31 PM. Reason: btw HAPPY TURKEY DAY EVERYONE! MERCEDES BENZ RULE!!!
11-26-2009, 04:46 PM
#53
just to clear up confusion on exhaust modifications:
resonator: deleted, increases sound volume and changes pitch to a little deeper/more aggressive. lose about 5lbs of weight. no performance gains.
secondary cats: delete, pitch is same but volume increases. performance gains are 0-1whp. don't expect anything but sound here
primary cats: havent done it and wont, but high flow race cats you MAY see 5 whp and louder, more aggressive exhaust note.
headers: this is where the exhaust power is made. on a stock car, shorties should show 25+whp (IIRC) and a buttload of torque. exhaust note will deepen and become louder. this will ALSO lower boost and lower boost = less heat produced and less stress on the motor.....though i havent measured the effect. not sure how much heat the headers give off compared with the stock manifolds.
the stock exhaust manifolds are the bottleneck in the exhaust which is why you will see negligible if any power gains from deleting your secondaries or resonator. However, once the bottleneck has been removed (by installing headers), you may see a slight gain by improving the exhaust flow in deleting the secondary cats and resonator and replacing them with a straight pipe and upgrading the primaries (though i think they are solid enough as is).
as far as emissions testing goes, you WILL pass smog tests with headers, deleted resonator, secondaries, and high flow primary cats. however, depending on your state, you may not pass visual test/exam/emissions. they don't do visual here so i'm not concerned.
resonator: deleted, increases sound volume and changes pitch to a little deeper/more aggressive. lose about 5lbs of weight. no performance gains.
secondary cats: delete, pitch is same but volume increases. performance gains are 0-1whp. don't expect anything but sound here
primary cats: havent done it and wont, but high flow race cats you MAY see 5 whp and louder, more aggressive exhaust note.
headers: this is where the exhaust power is made. on a stock car, shorties should show 25+whp (IIRC) and a buttload of torque. exhaust note will deepen and become louder. this will ALSO lower boost and lower boost = less heat produced and less stress on the motor.....though i havent measured the effect. not sure how much heat the headers give off compared with the stock manifolds.
the stock exhaust manifolds are the bottleneck in the exhaust which is why you will see negligible if any power gains from deleting your secondaries or resonator. However, once the bottleneck has been removed (by installing headers), you may see a slight gain by improving the exhaust flow in deleting the secondary cats and resonator and replacing them with a straight pipe and upgrading the primaries (though i think they are solid enough as is).
as far as emissions testing goes, you WILL pass smog tests with headers, deleted resonator, secondaries, and high flow primary cats. however, depending on your state, you may not pass visual test/exam/emissions. they don't do visual here so i'm not concerned.
Last edited by jturkel; 11-26-2009 at 04:54 PM.
11-26-2009, 06:13 PM
#54
just to clear up confusion on exhaust modifications:
resonator: deleted, increases sound volume and changes pitch to a little deeper/more aggressive. lose about 5lbs of weight. no performance gains.
secondary cats: delete, pitch is same but volume increases. performance gains are 0-1whp. don't expect anything but sound here
primary cats: havent done it and wont, but high flow race cats you MAY see 5 whp and louder, more aggressive exhaust note.
headers: this is where the exhaust power is made. on a stock car, shorties should show 25+whp (IIRC) and a buttload of torque. exhaust note will deepen and become louder. this will ALSO lower boost and lower boost = less heat produced and less stress on the motor.....though i havent measured the effect. not sure how much heat the headers give off compared with the stock manifolds.
the stock exhaust manifolds are the bottleneck in the exhaust which is why you will see negligible if any power gains from deleting your secondaries or resonator. However, once the bottleneck has been removed (by installing headers), you may see a slight gain by improving the exhaust flow in deleting the secondary cats and resonator and replacing them with a straight pipe and upgrading the primaries (though i think they are solid enough as is).
as far as emissions testing goes, you WILL pass smog tests with headers, deleted resonator, secondaries, and high flow primary cats. however, depending on your state, you may not pass visual test/exam/emissions. they don't do visual here so i'm not concerned.
resonator: deleted, increases sound volume and changes pitch to a little deeper/more aggressive. lose about 5lbs of weight. no performance gains.
secondary cats: delete, pitch is same but volume increases. performance gains are 0-1whp. don't expect anything but sound here
primary cats: havent done it and wont, but high flow race cats you MAY see 5 whp and louder, more aggressive exhaust note.
headers: this is where the exhaust power is made. on a stock car, shorties should show 25+whp (IIRC) and a buttload of torque. exhaust note will deepen and become louder. this will ALSO lower boost and lower boost = less heat produced and less stress on the motor.....though i havent measured the effect. not sure how much heat the headers give off compared with the stock manifolds.
the stock exhaust manifolds are the bottleneck in the exhaust which is why you will see negligible if any power gains from deleting your secondaries or resonator. However, once the bottleneck has been removed (by installing headers), you may see a slight gain by improving the exhaust flow in deleting the secondary cats and resonator and replacing them with a straight pipe and upgrading the primaries (though i think they are solid enough as is).
as far as emissions testing goes, you WILL pass smog tests with headers, deleted resonator, secondaries, and high flow primary cats. however, depending on your state, you may not pass visual test/exam/emissions. they don't do visual here so i'm not concerned.
Andy
11-26-2009, 07:48 PM
#55
before you mess with the primary cats, i would delete the resonator. if that isnt enough sound, then delete the secondaries. if you STILL want more sound at that point, or you decide you want more power and can dish out some money, then get headers. only a couple people have aftermarket primary cats. PM sillverbulletamg and ask if he noticed any difference in power/sound with his.
bottom line though:
if you want serious power, get headers.
if you just want a more aggressive sounding and louder exhaust but don't want to spend too much, delete resonator and secondary cats.
if you want to do the complete exhaust system, do everything (though again, i'm not touching my primaries lol).
headers WILL make your exhaust sound much better too, though i haven't heard a car with headers and resonator.
11-26-2009, 08:13 PM
#56
the conclusion come down to your wallet/bank account/funds appropriation
before you mess with the primary cats, i would delete the resonator. if that isnt enough sound, then delete the secondaries. if you STILL want more sound at that point, or you decide you want more power and can dish out some money, then get headers. only a couple people have aftermarket primary cats. PM sillverbulletamg and ask if he noticed any difference in power/sound with his.
bottom line though:
if you want serious power, get headers.
if you just want a more aggressive sounding and louder exhaust but don't want to spend too much, delete resonator and secondary cats.
if you want to do the complete exhaust system, do everything (though again, i'm not touching my primaries lol).
headers WILL make your exhaust sound much better too, though i haven't heard a car with headers and resonator.
before you mess with the primary cats, i would delete the resonator. if that isnt enough sound, then delete the secondaries. if you STILL want more sound at that point, or you decide you want more power and can dish out some money, then get headers. only a couple people have aftermarket primary cats. PM sillverbulletamg and ask if he noticed any difference in power/sound with his.
bottom line though:
if you want serious power, get headers.
if you just want a more aggressive sounding and louder exhaust but don't want to spend too much, delete resonator and secondary cats.
if you want to do the complete exhaust system, do everything (though again, i'm not touching my primaries lol).
headers WILL make your exhaust sound much better too, though i haven't heard a car with headers and resonator.
btw, I dont think I have the resonator jsut the primary and the second cats.
Andy
11-26-2009, 09:22 PM
#58
tons of C32 owners have done exhaust projects, including Jake and Jerry of Eurocharged, and what they've come down to is that the only exhaust modification that really makes any notable power is headers.
for the C55, a true dual exhaust would definitely yield some nice power gains.
you have a C32 correct? (i dont see it listed in your vehicles you listed)
to determine if you have a resonator, you could look under your car......to state it as simply as possible, if you start from the front of the car there are two exhaust pipes. they converge into one a the y-pipe. after the y-pipe. if you have a "pipe" that looks wider than the rest of it and almost rectangular prism-esque in shape, then you have a resonator. if there is just a straight pipe all the way back, then you don't have a resonator
as far as secondary cats being replaced with high flow cats, yes you can do that. you could either replace the secondary cats with 200 cell high flow cats or straight pipes. i'm going to be replacing mine with straight pipes.
and the secondary cats, while catalytic converters, are not monitored O2 sensors or the ECU.....so you wont throw any codes switching them out.
for the C55, a true dual exhaust would definitely yield some nice power gains.
to determine if you have a resonator, you could look under your car......to state it as simply as possible, if you start from the front of the car there are two exhaust pipes. they converge into one a the y-pipe. after the y-pipe. if you have a "pipe" that looks wider than the rest of it and almost rectangular prism-esque in shape, then you have a resonator. if there is just a straight pipe all the way back, then you don't have a resonator
as far as secondary cats being replaced with high flow cats, yes you can do that. you could either replace the secondary cats with 200 cell high flow cats or straight pipes. i'm going to be replacing mine with straight pipes.
and the secondary cats, while catalytic converters, are not monitored O2 sensors or the ECU.....so you wont throw any codes switching them out.
11-26-2009, 10:12 PM
#59
MBWorld Fanatic!
updated vid of the exhaust :-] after thanksgiving dinner..
drove up the nordstrom's parking garage..pulled out he blackerry (only video recording device i had at that time) and had my bro record :-]
http://www.youtube.com/watch?v=RfOlqRHcPGI
11-27-2009, 07:30 PM
#60
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C32 ///AMG
Here's my C32 with the resonator deleted. I posted it a long time ago, but for those interested in hearing how it sounds, here you go.
http://www.youtube.com/watch?v=sh6LiBjrW80
http://www.youtube.com/watch?v=sh6LiBjrW80
11-28-2009, 08:33 PM
#62
MBWorld Fanatic!
Yes sir, its just resonator delete. 2ndry cats are still in. They make. Nice sleek subtle yet nice roary sound bro, especially on WOT. Going 80mph on the freway it just rumbles..I actually like the sound of my car now, been wanting to delete the cats as well..but that's off my mind now :-)
How come man, r u plannin on doing it to ur CLK?
12-01-2009, 04:23 PM
#63
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09 CLK550
So i called a few good shops that people pmded me one shop said $150 per pipe so,
2 resonators and 1 cat comes out to $350 another shop quoted me $300 seems to be much Higher than anyones posted price here. One shop told me $700 i was like year right...... if i find a shop to do it for $200 i will do it but i am nt going in to $300.
2 resonators and 1 cat comes out to $350 another shop quoted me $300 seems to be much Higher than anyones posted price here. One shop told me $700 i was like year right...... if i find a shop to do it for $200 i will do it but i am nt going in to $300.
12-01-2009, 04:44 PM
#64
Hey andy,
Yes sir, its just resonator delete. 2ndry cats are still in. They make. Nice sleek subtle yet nice roary sound bro, especially on WOT. Going 80mph on the freway it just rumbles..I actually like the sound of my car now, been wanting to delete the cats as well..but that's off my mind now :-)
How come man, r u plannin on doing it to ur CLK?
Yes sir, its just resonator delete. 2ndry cats are still in. They make. Nice sleek subtle yet nice roary sound bro, especially on WOT. Going 80mph on the freway it just rumbles..I actually like the sound of my car now, been wanting to delete the cats as well..but that's off my mind now :-)
How come man, r u plannin on doing it to ur CLK?
btw, you should have rev your engine more so I can hear it...not enough for me
.Andy
12-01-2009, 10:36 PM
#65
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C55 ///AMG, 535xi
So i called a few good shops that people pmded me one shop said $150 per pipe so,
2 resonators and 1 cat comes out to $350 another shop quoted me $300 seems to be much Higher than anyones posted price here. One shop told me $700 i was like year right...... if i find a shop to do it for $200 i will do it but i am nt going in to $300.
2 resonators and 1 cat comes out to $350 another shop quoted me $300 seems to be much Higher than anyones posted price here. One shop told me $700 i was like year right...... if i find a shop to do it for $200 i will do it but i am nt going in to $300.
I suggest you doing an actual exhaust, meaning, cutting off both secondaries, and the resonator, and making a NEW custom pipe, not a "add on" section.
12-01-2009, 11:35 PM
#66
MBWorld Fanatic!
rev limiter? that was at park...wait..i should try revving it on Neutral..
12-01-2009, 11:53 PM
#67
