Exhaust flow....
#1
So I've recently completed the exhaust with the Y pipe. Everything's good for now but I eventually will want to tune out the small low rpm rasp as I'm an avid sound man. My current exhaust chain is Ypipe>Test pipe>Stainless b pipe>Stock muffler. Basically straight through. Awesome power and WOT sound but a little a gnarly at low Rpms. Nothing loud...but not quite "tuned". There's a Vibrant oval resonator that I'm thinking of having welded into the test pipe. This resonator is meant to take out rasp according to the literature. I was curious if anyone has done a similar thing with good results. My friend says not to discredit a high flow cat, but I feel like putting on a y pipe, then adding a cat is an oxymoron? Anyone dealt this this issue and solved it with a resonator?
Last edited by 2kMaxim; 02-23-2015 at 03:48 PM.
#2
I know with the 3" stainless exhaust from BRM, I put a resonated test pipe on it and have no rasp, but a deep growl. I know I chose the resonated pipe instead of a straight pipe to avoid the potential rasp, but I don't know how the straight pipe sounds in person.
I know this isn't your setup, and it doesn't have the stock muffler, but the resonated test pipe with a 14" resonator on my set up gives no rasp.
I know this isn't your setup, and it doesn't have the stock muffler, but the resonated test pipe with a 14" resonator on my set up gives no rasp.
#4
<a href="http://s1175.photobucket.com/user/matt_mcdonald4/media/Mobile%20Uploads/2014-05/C8A24951-419C-4FCE-A11F-4AC329A26A31_zps7fop2kt2.jpg.html" target="_blank"><img src="http://i1175.photobucket.com/albums/r625/matt_mcdonald4/Mobile%20Uploads/2014-05/C8A24951-419C-4FCE-A11F-4AC329A26A31_zps7fop2kt2.jpg" border="0" alt=" photo C8A24951-419C-4FCE-A11F-4AC329A26A31_zps7fop2kt2.jpg"/></a>
#6
I was looking at this guy....could get it welded right into the test pipe.
http://www.amazon.com/gp/aw/d/B00180...211590-0798212
http://www.amazon.com/gp/aw/d/B00180...211590-0798212
#9
Which Ypipe did you get?
The raspy sounds all come from having an unequal length Ypipe vs. equal length.
I have no rasp and a very smooth, toned sound. And I'm only using the supplied Megan Racing resonator which is a bullet style straight pipe. My setup is equal length 2.5" Cattman Ypipe and 2.5" full exhaust (currently with stock cat, because my used hi-flow cat started to stink like a$$)
Hi-flow cat is a good idea IMO, I need myself a new one actually.
The raspy sounds all come from having an unequal length Ypipe vs. equal length.
I have no rasp and a very smooth, toned sound. And I'm only using the supplied Megan Racing resonator which is a bullet style straight pipe. My setup is equal length 2.5" Cattman Ypipe and 2.5" full exhaust (currently with stock cat, because my used hi-flow cat started to stink like a$$)
Hi-flow cat is a good idea IMO, I need myself a new one actually.
#11
Depends on how loud the music is
No seriously, it's enough to drive some average folk into going bat-$h!t crazy. But then again, the sounds it makes are known to make grown men jizz their pants...
Its all subjective, but it's definitely not quiet by any means.
No seriously, it's enough to drive some average folk into going bat-$h!t crazy. But then again, the sounds it makes are known to make grown men jizz their pants...
Its all subjective, but it's definitely not quiet by any means.
#12
Which Ypipe did you get?
The raspy sounds all come from having an unequal length Ypipe vs. equal length.
I have no rasp and a very smooth, toned sound. And I'm only using the supplied Megan Racing resonator which is a bullet style straight pipe. My setup is equal length 2.5" Cattman Ypipe and 2.5" full exhaust (currently with stock cat, because my used hi-flow cat started to stink like a$$)
Hi-flow cat is a good idea IMO, I need myself a new one actually.
The raspy sounds all come from having an unequal length Ypipe vs. equal length.
I have no rasp and a very smooth, toned sound. And I'm only using the supplied Megan Racing resonator which is a bullet style straight pipe. My setup is equal length 2.5" Cattman Ypipe and 2.5" full exhaust (currently with stock cat, because my used hi-flow cat started to stink like a$$)
Hi-flow cat is a good idea IMO, I need myself a new one actually.
#13
If you still have a stock rear muffler and you think it's a bit raspy it's due to the fact that you chose a test pipe....My 3" Cattman was a bit on the droney side for my taste so I manufactured/fitted a Magnaflow 6" round x 18" muffler with flanges to be a pure bolt on for the 3" Cattman exhaust guys and it really quieted things down alot....BUT!!!! If you're still running the 2" OEM size tubing or a 2.5" upgraded Catback using a 22" long x 4" round Magnaflow will work well....GL
#14
If you still have a stock rear muffler and you think it's a bit raspy it's due to the fact that you chose a test pipe....My 3" Cattman was a bit on the droney side for my taste so I manufactured/fitted a Magnaflow 6" round x 18" muffler with flanges to be a pure bolt on for the 3" Cattman exhaust guys and it really quieted things down alot....BUT!!!! If you're still running the 2" OEM size tubing or a 2.5" upgraded Catback using a 22" long x 4" round Magnaflow will work well....GL
Yeah it's 2.5 from the ypipe on back I believe. I've definitely given some thought to the resonator. I figured if I got the resonator welded into the test pipe, it might give the look of a cat Problem I face is I have an awesome muffler shop where the owner said he's willing to overlook the test pipe if he looks in my hood and sees a pre cat. And if it passes obd II test. He didn't put the Y on, I had my regular mechanic do that. So if I let him see under the car he may or may not still be ok with passing me...lol
#15
Yeah it's 2.5 from the ypipe on back I believe. I've definitely given some thought to the resonator. I figured if I got the resonator welded into the test pipe, it might give the look of a cat Problem I face is I have an awesome muffler shop where the owner said he's willing to overlook the test pipe if he looks in my hood and sees a pre cat. And if it passes obd II test. He didn't put the Y on, I had my regular mechanic do that. So if I let him see under the car he may or may not still be ok with passing me...lol
#18
#19
So I'm giving it some thought. I think when funds are back to normal I'm gonna have my mechanic gut my front precat. Then with the Y pipe I just out in it will basically be like full headers. I'll use non foulers on the sensors and put a magnaflow cat where the test pipe is. Badabing....big power...no smell
#20
the rasp is in the test pipe for sure
I have a 2002 max STRAIGHT PIPED. no cats. no resonators. I gutted my pre cats, and no cats after. I have a 3" brm resonatorless catback. with the muffler they provide. I changed the high flow cat to a test pipe and that's when the rasp started. moral of the story. have a resonation at the test pipe. ps. my car is stupid loud and drones like there is a pipe organ in my car....
#21
My car isn’t raspy at all. And I also have no cats, pre or main. It might be those gutted pre-cats you have, vs headers. My car also isn’t terribly loud. I credit that the huge Carltonator. (6" round, 30" long)
Last edited by NmexMAX; 04-01-2015 at 06:58 AM.
#22
+1^
I have pretty much the same setup. Gutted pre and main cats with a huge Magnaflow resonator. Never any rasp. At times I almost wish it was louder but then I remember the drone before the Magnaflow.
I have pretty much the same setup. Gutted pre and main cats with a huge Magnaflow resonator. Never any rasp. At times I almost wish it was louder but then I remember the drone before the Magnaflow.
#23
Yeah I still haven't gutted the other precat yet. I want to dyno with this ypipe on to see what the difference is. I've had a couple different opinions on whether the front precat will even be worth the trouble or not since its straight piping and the element itself isn't that big. Also no hassle with non foulers or Sims this way. Depending on the dyno I might direct that money into an safc tune...lol. Also putting one of those Vibrant oval resonators into the test pipe right behind the y pipe might fix the tiny low rpm rasp area.
#24
The Vibrant won't sound nor flow as good as the 6" round Magnaflow (Magnaflow Muffler use a 1 piece seamless straight thru design perforated tube) Vibrant is a 3 piece straight thru design tube
#25
http://www.tunersports.com/images/pr...-resonator.jpg
#26
Just to be clear, this is the one I mean...it's only about 10 inches long
http://www.tunersports.com/images/pr...-resonator.jpg
http://www.tunersports.com/images/pr...-resonator.jpg
#27
#28
It's advertised that it was made to reduce "rifling" sound in straight through exhausts. I assume that's another word for rasp. I don't need the exhaust quieter.....I really don't NEED anything.....I'd just like to reduce rasp way down low in the rpm range. I'm really thinking my plan of gutting the front pre cat, using non foulers, and slapping a magnaflow cat where the test pipe is isn't a bad idea. Cleans up sound and cleans up smell which does occasionally bother me...lol. I'm sure I'll sacrifice a couple hp and gain a couple torque....at least that's what happened with my IS300
#29
So, you're saying, you’d basically be making more horsepower earlier in the RPM range, and lose some hp in the higher revs.
I wouldn’t assume that, but the engines are fairly different. FWD V, vs RWD I, etc. But, either way, if the sound bothers you, do something about it, that’s what I did.
I wouldn’t assume that, but the engines are fairly different. FWD V, vs RWD I, etc. But, either way, if the sound bothers you, do something about it, that’s what I did.
#30
So, you're saying, you’d basically be making more horsepower earlier in the RPM range, and lose some hp in the higher revs.
I wouldn’t assume that, but the engines are fairly different. FWD V, vs RWD I, etc. But, either way, if the sound bothers you, do something about it, that’s what I did.
I wouldn’t assume that, but the engines are fairly different. FWD V, vs RWD I, etc. But, either way, if the sound bothers you, do something about it, that’s what I did.
#33
#34
the front precat is a 2 minute job
The rear precat is a royal *****. But they both make a difference. But as far as drone and rasp. I had no rasp at all till the hi flow catcat delete. And it only rasps at 3500. When everything is still warming up to running temp. And the drone started when I switched to 3" piping
#35
Cherrybomb glasspacks are louvered! Magnaflow glasspack are just slender space savings bullet type but with perforated cores not louvered!
#38
OEM injectors, no tuning necessary.
#39
When you ditch both precats, your car will be slightly lean because your car is breathing better. But the ECU, continually reading the O2s will adjust it back to slightly rich again. You would rather be slightly rich than slightly lean.
OEM injectors, no tuning necessary.
#40
Nope, the MAF is used for that (AFR’s). O2’s pretty much take care of idle and anything below 25 MPH and VERY low throttle angles. If we’ve learned anything in the past 15 years it’s that these are terribly rich from the factory as it is and still require AFR tuning even in stock form, even more so when modified.