I am new to the LLY what exhaust opptions are available and is the down pipe upgrade a plus or no change in the way it runs I'll be putting a Juice and an AFE intake at same time and tips? Does anyone have a Magnaflow part number that will fit and what might have to be done to mount an older kit from turbo back or is a cat back system worthwile?





Thanks Jared

Welcome to the best forum on the net. Try out the search button on top right, on exhaust systems. You will have hours of reading

Any suggestions?

I don't have my d-max yet(ck sig) but I have been reading till my eyes hurt on what to buy. Maybe MBRP. I still have time to decide. Suggest keep searching you will find an answer. Good Luck. Try his Thread:

http://www.dieselplace.com/forum/forum_posts.asp?TID=11049&KW=exhaust

I am trying to get this so you can click on it but I can't get it to work Edited by: 2500HD04

JaMan,


I put the MBRP 4" cat back on a while back. It sounded great. Not too loud, but you could definitely tell there was something back there. If you got on it, you could hear it a little bit, but outside the truck, I'm sure it sounded pretty good.


Last night, I put on the 4" downpipe. OMG, what a difference in sound. It is MUCH louder than just the cat-back. Before I put it on, I could hear the engine over the exhaust, with the downpipe, you can hear the exhaust over the engine. This thing is perfect for me.


The one thing you will notice a lot more is the turbo noise at idle. The vanes go pretty much shut at idle, so you will hear the exhaust hissing at idle. Some people have said they don't like that, but I think it's kind of cool.


I was grinning ear to ear last night testing the downpipe. . .


So the MBRP has two options on sound (if you are talking single exit) not so aggressive but sounds good (without downpipe), and pretty aggressive and sounds good (with downpipe).


If you aren't sure, go with the cat-back first, then if it isn't loud enough for you, add the downpipe later. No big deal.


The exhaust is very easy to install. Took me just under two hours in nearly complete darkness and I took the exhaust off in one piece (just in case I ever want to put it back on).


It did take me a while to get the Cat off. It takes a little wiggling and working to get it out, but it will come without removing any major stuff, but I tried to do it with the rest of the exhaust in place. You have to get the cat-back part out of the way first, then you'll have enough room to get the cat back, turn and twist it to get it out. I also had to squeeze the bracket above the crossmember down to be able to slide the cat forward over it. It's a pretty tight squeeze but it will come out.


Dennis

OK I figured it out, try this thread
http://dieselplace.com/forum/forum_posts.asp?TID=11049&KW=exhaust

JaMan,


I put the MBRP 4" cat back on a while back. It sounded great. Not too loud, but you could definitely tell there was something back there. If you got on it, you could hear it a little bit, but outside the truck, I'm sure it sounded pretty good.


Last night, I put on the 4" downpipe. OMG, what a difference in sound. It is MUCH louder than just the cat-back. Before I put it on, I could hear the engine over the exhaust, with the downpipe, you can hear the exhaust over the engine. This thing is perfect for me.


The one thing you will notice a lot more is the turbo noise at idle. The vanes go pretty much shut at idle, so you will hear the exhaust hissing at idle. Some people have said they don't like that, but I think it's kind of cool.


I was grinning ear to ear last night testing the downpipe. . .


So the MBRP has two options on sound (if you are talking single exit) not so aggressive but sounds good (without downpipe), and pretty aggressive and sounds good (with downpipe).


If you aren't sure, go with the cat-back first, then if it isn't loud enough for you, add the downpipe later. No big deal.


The exhaust is very easy to install. Took me just under two hours in nearly complete darkness and I took the exhaust off in one piece (just in case I ever want to put it back on).


It did take me a while to get the Cat off. It takes a little wiggling and working to get it out, but it will come without removing any major stuff, but I tried to do it with the rest of the exhaust in place. You have to get the cat-back part out of the way first, then you'll have enough room to get the cat back, turn and twist it to get it out. I also had to squeeze the bracket above the crossmember down to be able to slide the cat forward over it. It's a pretty tight squeeze but it will come out.


Dennis With the down pipe did you get rid of your CAT? And are you running an aftermarket intake on your truck?

Can get Magnaflow locally is there a good kit for the LLY and does any one have a part number so shop doesn't screw up?

The downpipe does get rid of the Catalytic Converter. It's basically 4" all the way back now (don't know the technical name for the flange, but it is at the back of the engine, not exactly at the outlet of the turbo, but shortly thereafter, necks up from about 3-1/2" to 4" with the downpipe).


I am running the stock air intake, and very happy with it. A little over 12,000 miles and my filter user-uper gauge is at about 50% left.


Dennis

JaMan


I have the MBRP t-409 single turbo back system and agree with baimpala's observations. So far have put on 2500 miles with no problems. Performance is marginally better egt is marginally lower. Picked up about 2+ lbs of boost.


Road Boss, the downpipe replaces the one incorporating the cat. Also I am currently using a AFE stage I intake.

jaman check your im box i sent you a message

JaMan,


Take a look at this review done on this site, it'll get you a bunch of info, call us if we can help you with any questions etc.


MBRP EXHAUST (http://dieselplace.com/forum/forum_posts.asp?TID=11123&PN=1)


Mark @ DPPIEdited by: Mark Craig

Hey JaMan


I installed the Magnaflow cat back system Part # 15926(crew cab short box). I am very pleased with it. This is the basic system (no tip and a non-polished muffler). I purchased the tip separately because it was cheaper that way (tip # 35120). Throttle response seams to have improved and it also seams that engine temps have decreased. Nice mellow sound. Piece of cake to install. Consider 4" exhaust as a prelude mod for a chip or something.Edited by: AbsoluteGMC

AbsoluteGMC, would you be able to put a LB7 down pipe on with this system, or will it not work? I can get Magnaflow locally so don't really want a MBRP so no thanks to all above, no feelings intended.Gotta be able to beat my brother with a '02 Dodge, man that truck friggin flys.http://www.dieselplace.com/forum/smileys/Evil Smile.gif

I would imagine that most systems that are 4" would be pretty comparable as long as they have a free-flowing muffler. You will be fine with the Magnaflow, don't they offer a downpipe?


Dennis

JaMan,


Yes I think that some of the guys here have done that but if you are going to go through that much trouble then just get the magnaflow kit #15976. This will replace all of the exhaust pipe that is replaceable. Again this is the basic so you will have to buy the tip separately. But as is already known to most a 4" exhaust will not improve performance by any great means, it is just one of the things to do before one increases performance by means of a chip.


www.magnaflow.com (http://www.magnaflow.com)


Edited by: AbsoluteGMC

anyone put summit racing 4" on thier LLY?

I would love to put a 4'' down pipe on my truck. But I have a CAT and I don't want to get caught with my pants down. I HATE having a Cali truck!

JaMan,


NOTE: Magnaflow does NOT have the 4" downpipe. You will ONLY be able to do Cat back.


That being said, I would recommend MBRP. Then you have the OPTION of doing turbo back later on if you want to. Thats what Im going to go with. Its a kick _$$ system. Im going Cat back for now. THen Ill go to the downpipe option later. (Cant shock the wife too quick. Im going stealth on the mods. SHe'll know its modified if/when she hits the gas.....hehehhe.)


FYI: Mark at DPPI will take care of you. Those folks are great to work with and will take as much time as you need making sure to get you hooked up.

Mark @ DPPI how bout a sound clip or video showing what the exhaust sounds like? I've heard Banks and it sounds okay, what I'm really looking for is the 'big rid' turbo spooling sound. What I don't want is a gawd aweful loud diesel; if I wanted loud I would just get an 8.1L big block. Any suggstions folks?

y2kboti,


Go to the www.dieselperfomranceparts.com (http://www.dieselperfomranceparts.com) website. There are sound bites there of the singles and duals. Also if you go to this thread, MB posted a video of his truck that is pretty good.


http://dieselplace.com/forum/forum_posts.asp?TID=8692&KW=dual&TPN=1


Dennis

Dojohnso,


I think you should check the web site again and the part number I supplied above. The down pipe is avaiable.


AbsoluteGMC

Road Boss,


That's one of the big advanyages of the MBRP systems, I posted his else where but it applies to your needs so I will post it here too:


The MBRP systems we have do exaclty what you're asking for. The system starts/bolts on at the 4 bolt flange after the cat. We also have a test pipe for off road racing use that bolts to the front of the 4 bolt flange and goes up under the firewall to the V band clamp. 4 bolta and one clmp and you can interchange the factory front pipe in minutes. To my knowledge we are the only company that has the easily installed/uninstalled front pipe system


Check this link to a review of the systems done on this site:


MBRP EXHAUST (http://dieselplace.com/forum/forum_posts.asp?TID=11123&PN=1)


Mark @ DPPIEdited by: Mark Craig

baimpala thank you. I guess I should have looked a little further.

y2kboti,


Can you help me for some reason a lot of folks miss the sound bites and other technical info when they look at our site. What caused you to miss it? Maybe I need to make some changes to make it easier to find etc. Let me know your thoughts, and thanks for any info you can provide.


Mark @ DPPI

Mark @ DPPI how bout a sound clip or video showing what the exhaust sounds like? I've heard Banks and it sounds okay, what I'm really looking for is the 'big rid' turbo spooling sound. What I don't want is a gawd aweful loud diesel; if I wanted loud I would just get an 8.1L big block. Any suggstions folks?




y2kboti, here's another suggestion you might want to check out... I've got a 4" system with an Aero-Turbo muffler on my LLY. Real mileage improvement and great sound.


The Aero-Turbo enhances the low tones, and adds a big diesel whistle to it. Someone asked me this weekend at the campground if I had a jet engine in my truck! Because of their design, I don't think the others will really be able to duplicate it. It's louder than stock, but my cab is quieter than my buddy's (LB7 with 3.5" and FlowMaster). My turbo spool up is real quick and since adding this system (plus air intake improvements) it takes off much faster at any speed. They make a 3.5" in and out and a 4" in and out.


I'm not affiliated with Aero-Turbine but here's their web site. They have sound clips. http://www.aero-turbine.com.

kolekamp I'll check out the site. How much of an improvement are you talking about?

Mark the site is layed out easily. The exhaust is easy to find but when I look at the page the text in the box looks like a header or banner more than a link to the audio/visual clips.

y2kboti,


Here are the numbers, they are accurate, but this is for all the changes I did. So you need to know those too.


K&N Air Filter = better flow in. Also bored about a dozed 3/4" holes in the bottom of the air box where I could, don't know if this actually does anything but there is more room for air in. Completely replaced the 3.5" exhaust with 4" (turbo back) so no cat now and unhooked EGR. Added the 4" Aero-Turbine muffler instead of the straight thru one that came with the 4" system. I originally had a polished 5 1/2" tip but that was like a megaphone so I put a piece of 4" pipe on instead, angle cut like the stock system and got the sound I wanted.


Daily driving, 28 miles round trip, city and a few miles highway, improved 2 miles per gallon from 15.5 to 17.3. Pure highway (70 to 75 mph) went from 16.8 to 19.7. Towing a 7,500 lb. trailer went from 10.5 to 13.1. Maybe it's me but starting and idling the truck seems to use more fuel, not less.


The cost of the system including the $200 muffler was $790. Should be paid for in about 50,000 miles at 2 miles per gallon. I still have the full stock system and can get it back on in an hour and a half if I need to go see the dealer for something serious.


You are right about their web site. It looks nice at first but sucks Ford exhaust for functionality. If you keep poking around you should be able to get a sound clip, the promo .mpg is kinda neat too.


BTW, my numbers INCLUDE significant warm up time after starting and idling if I go into a gas station to buy cigs. I am not trying to knock MBRP, or anyone else, many systems are good and MBRP is quite popular and looks good. I am real happy with mine tho.Edited by: kolekamp

The Aero-Turbo enhances the low tones, and adds a big diesel whistle to it...
Thats what I'm looking for. I want the big rig diesel whistle sound, I don't want my engine sounding like a gasser. On the other hand while I want the big rid diesel whistle I don't want any resonance or the sound to be any louder in the cab than stock. Do you have any video or sound clips of your Duramax? The Cummins and PS sound good on their site but no Dmax sound clip. BTW what did you do for the rest of the exhaust since the Aeroturbine is just the muffler part?Edited by: y2kboti