Tune plus downpipes, worth it??

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Homer Jay

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Hey guys,

I was wondering if anyone has any info on the gains related to a downpipe when the vehicle is being tuned by MPT or 5 Star?

I know MPT doesn't tune for emissions controlled equipment changes...

However I am just trying to decide if there is any proven, measurable performance benefit to going with the Stainless Works catted or the Kooks/SPD catted downpipes when the vehicle is tuned?

Anyone measure/test this yet?

Thanks!
 

NickSim

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I should know soon, I have Stainless Works catless DP on the truck and am waiting on 5 Star to get the tune back to me... It's been over 2 weeks since I sent it and they are having some kind of issue getting it back. I'm optimistic though that it will have been worth it :happy107:
 

cobra281

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I should know soon, I have Stainless Works catless DP on the truck and am waiting on 5 Star to get the tune back to me... It's been over 2 weeks since I sent it and they are having some kind of issue getting it back. I'm optimistic though that it will have been worth it :happy107:

Was looking at the exact setup... Noticeable difference in sound and performance on the downpipe?
 

NickSim

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Yes and yes... although not dramatic by any means. Maybe 10-15hp, maybe.

I started with an aFe Rebel side exit exhaust, it was loud and aggressive. Then after DPs it became ridiculous, it was soo loud that the interior door panels were rattling! You literally couldn't hold a conversation inside the truck while cruising. So I went back to factory exhaust for now and it actually is pretty nice.

Unfortunately without cats it's ricer/raspy inside the cab, but by the time it makes it through the (factory) exhaust it becomes more throaty so outside it's a nice step up in both volume and aggressiveness. Cruising is quiet, no drone, but anything over 1/3 throttle and 3k+ rpm and it opens up pretty good.

My suggestion to anyone is start with DPs before you even think about exhaust, catless if you don't mind rasp and want more volume, hi-flow catted if you want a lower rumble and quieter. (given the opportunity, I would go catted next time)

I do however have a little beef with Stainless Works at this point... I like the idea of going to a flat mating surface over the factory "adapter flange" for increased flow, however the exhaust if very rigid and I doubt it flexes nearly as much as the engine mounts. Also, more importantly the DPs are now the lowest part of the truck! It sits about 3/4"-1" lower than the factory skid plates. Imagine hitting a rock when off roading, not only will it tear up the exhaust but it most likely will damage the turbos/headers.

I brought this to the attention of Stainless Works, they seemed to be genuinely concerned and since only one of them really "off roads" he was the one who really understood the issue. He asked for me to send him pictures, which I did however I have yet to hear a response.

Between 5 Star taking 2+ weeks for the tune and Stainless Works 2+ weeks no response, I feel like a whiney a-b when even talking about it...
 

Bullishone

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The SW are an accident waiting to happen.

Get kooks.

Sent from my PH-1 using Tapatalk
 
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