It that specifically for that turbo or or all of em??
I'm bout to buy a 5" for mine, stock turbos and the Smarty.
Elaborate please sir.

 

cquestad,

Could you explain your comment about 5" and a 62/12. I'm running what's listed in my sig and noticed cooler egt's and quicker spool-up with my 5". Just curious, not trying to start anything.

Jacob

 

My 5 inch magnaflow drones and is not pleasant to listen to, especially when towing. No cat.

 

I love the sound and performance of my truck's MBRP 5" with a 6" tip.

5" will really lower the EGTs.....especially with the 04.5' elbow!

 

If you run it straight piped be prepared to have your teeth chattered!!! I couldn't hack it it was worse than a migraine... Get a good 5" donaldson flow through muffler....

 

where did you get your muffler.... i think im going deaf

 

I think you are looking for a Donaldson M090535. You can find it here:
http://www.ryderfleetproducts.com/cg...uct_detail.jsp

 

I second that. I love my 5" with 6" tip. I only have the Cat back, and wouldnt ever think about straight pipe or even turbo back. Sounds mean, but yet cruises well w/o being loud in the cab.

 

The Expandit system I had flared to 5" within about 2" of the turbo outlet. This is probably what gave me the turbo lag I had. The other manufacturers probably flare further back to avoid the loss of low end torque. That and the incredible amount of noise over stock is what pushed me to get a 4" system back on. I could not carry on a conversation with a window down.
Mike
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Yeah the Shop Diesel kit I have is 5" straight off the turbo. It's a little loud for me and I did notice a little more lag on the bottom end. I'm looking for a muffler right now.

 

That's the ticket!!!! Best muffler hands dowm imo!!!!

 

so with a 5 inch turbo back, do you lose the cat? i have mbrp 4 inch but looking to go to 5inch. the 4 is not much louder then stock i think and am looking to drop my egt.

 

Some kits come with couplings to keep the cat inline, some don't. If the cat should happen to be left out(which is illegal) hold on to it. For me, the EGTs were a solid 100° lower with a 5" system. Cool down times were also quite a bit shorter after a hard pull. I have a 4" Silverline system(very similar to the MBRP, and I can tell you in no uncertain terms that the 5" system was MUCH louder. The muffler delete plays a huge part in the noise level. A straight thru muffler hardly does any muffling IMHO.
Mike
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Read the specs...

https://dynamic.donaldson.com/webc/W...210&item=22271

That is a lot of "muffling"... 12-17 DBA

I have never had that experience with smaller turbos on many trucks(i.e. ANYTHING WITH A 4" outlet) hooking up a 5" downpipe and exhaust.

No effect on EGTS, NO CHANGE or EVEN SLOWER spool, and way more noise.

Sounds cool...but gets real old real quick if you tow or anything else. I see it as a waste of money. Fluid Dynamics (yes air is a fluid...lol) shows that there is a negative result to slowing the exhaust velocity and increasing the turbulence with regards to friction...it goes up..hence more back pressure so to speak.

If you want a 5" look...do the last 12" or just the over the axle portion of the pipe.

Save the money for a more effective mod...

 

I guess all this discussion begs the obvious question ... does anyone out there in DTR land know what the stock muffler flows, what the decibal attenuation is, etc? like the info you'd find on the donaldson dynamics site ...