nitis

I have an 06 ctd which has 4 " pipe already looking into pro flo mufflers and maybe a cat delete. I want a nice rumble but not excessive volume do to a lot of long stints in the rig. Am I thinking along the right lines here which length mufler and should I get an offset? any other suggestions on brands of muuffler and should I delete the cat or leave it. And how will it affect the overall performance?

ptgarcia

I basically asked the same question a couple weeks ago. The consensus was to replace the muffler only with a flow thru design. I bought the MBRP replacement muffler (I forget the part number, but if you contact Mark Craig at DPP he'll help you out). I ordered it last week and expected it today, but it looks like a no show. Anyway, most say it gives a nice tone without the drone and will lower EGT's 100 degrees or so. It comes with everything needed to mount for about $150.

There are other options out there that are a bit cheaper (Nelson, Donaldson) but they require a bit of pipe bending to make it work with the stock tail pipe.

nitis

what bout the kitty

ptgarcia

From what I have learned on this board, removing the cat increases sound and may induce drone, but there is little to no performance gain. I will be leaving mine in.

John Rodriguez

Little to no performance gain at stock powerlevels. While towing, dropping the kitty drops EGT's preturbo by 150 degrees. At 400whp and above, it's definetly a restriction.

RAMRODD

How about MPG gain from removing the kitty, did you notice a diff????

timtstur

On my 04.5 I had an exhaust shop delete the muffler and left the Cat in place. Sounds great, especially at low RPMs, and it's not overwhelming at high RPMs (freeway). Only cost $65 for the labor and pipe.

As others have said would happen, EGTs are lower by some, it seems to spool a little quicker, and, believe it or not, the fuel economy went up by 1 or so...? I never hand-calc. anything, just watch the computer readout, so it could be wrong, but it definitely reads differently now. It averages higher than it ever has before (around 19.5) and I'm on the pedal more since it sounds great!

I thought I'd try this before getting an aftermarket muffler and at this point I'm sticking with it.

Tim

BigBlueDiesel

Kit from MBRP is #MK-96116........includes muffler and s-bend pipe to lin it up right.

Roger

2-Stroke

I think I have the most "simple" and "efficient" exhaust mod.



Now, if you had asked in your title, and not so obtrusively loud... I wouldnt post hehe

BigBlueDiesel

I'll bet that thing rattles your teeth at 2300 rpms and 75 mph on the freeway........lol

Roger

2-Stroke

Naw man, it aint that bad! Its honestly smooth for what it is!

I helped Chuck D do his exhuast ('01) and ran 5" straight back from a 4" downpipe (about 7') and dumped it, and That thing HURTS!!!

djja918

I just ordered the MBRP muffler and "S" pipe to replace my stock muffler today from DPP. The muffler is a stainless flow through type and with the "S" pipe they claim you can do it yourself. The price to S.E. Ks is $163.84 and I should have it next Tuesday. They tried to sell me the cat test pipe for $61.00 but I declined. The part number is mk96116 as stated in an earlier thread.

ptgarcia

djja918,

If you do the install yourself, before you remove the stock muffler and tailpipe try and hold the new components up where they should go and check on the fit. On my MegaCab the fit could have been better. The hangars on the MBRP muffler were about 12" forward of where they needed to be (I had a muffler shop cut them off and reweld them in the right spot), and the "S" pipe needed to be trimmed. If I put it together the way it came the factory tailipe couldn't be reused.

djja918

Thanks ptgarcia,I'll check that before I get too carried away. I'll let you guys know how the install goes next week.

ptgarcia

Your welcome.

Paul