CatBack Exhaust Testing

[lesgarten]

That's a big ask - only because the install is lengthy and EMS hasn't offered. I am expecting some mid pipes for testing from EMS so we will be covering that in a separate thread.

Yeah, but I figured I'd shoot for the Big Enchilada! Never know unless yo go for it.

I'm thinking that since the DT/EMS design is so different, there may be some interest for you. You have the DT in place now and have those numbers.

Lot of work though for sure. The EMS may be a slightly more difficult install.

Either way, thanx tons for what you have done thus far!

 

[NKP Garage]

Yeah, but I figured I'd shoot for the Big Enchilada! Never know unless yo go for it.

I'm thinking that since the DT/EMS design is so different, there may be some interest for you. You have the DT in place now and have those numbers.

Lot of work though for sure. The EMS may be a slightly more difficult install.

Either way, thanx tons for what you have done thus far!

The EMSPowered headers should actually be slightly easier to install. But it's still a header install and slightly more involved than installing a cat-back exhaust.

 

[BBQ BOY]

Sound Clips?

 

[2000UZJ]

Doug Thorley, one of the best sounding exhausts I have ever heard. It does drone (laptop speakers won't quite do justice, but good speakers and a sub will), but you forget about it when you get on the skinny pedal. The thing I love the most is the down shifts, loud crackles, gurgles, and a nice tone.

 

[semlin]

nice work.

so, to clarify:

-all three tests were done on the same 2000 lc?

-all of these tests involved dt headers and stock midpipes with the only variable being catback?

-all three were done on the same dyno?

it would be worth editing post #2 to say this clearly i think. i had to read the whole thread to figure it out (i think i have it right).

it would also be nice also to go back to the your before and after dt header dyno tests and to prepare a graph showing the percentage differences between stock and with dt headers and then reverse engineering a hypothetical completely stock result using that percentage difference applied to your current dyno results. i think that would be a legit comparison.

https://forum.ih8mud.com/100-series-cruisers/514381-dt-headers-dyno-result-thread.html

i am surprised at how much difference just a cat back makes. it will be interesting to see the further impact of mid-pipes and/or the new ems long headers.

my manifold ticks nicely and i have a cheap aftermarket muffler and short pipes that sound awful at certain rpms and loads so i look forward to you next installment (in both senses).

 

[RobRed]

nice work.

so, to clarify:

-all three tests were done on the same 2000 lc?

-all of these tests involved dt headers and stock midpipes with the only variable being catback?

-all three were done on the same dyno?

it would be worth editing post #2 to say this clearly i think. i had to read the whole thread to figure it out (i think i have it right).

it would also be nice also to go back to the your before and after dt header dyno tests and to prepare a graph showing the percentage differences between stock and with dt headers and then reverse engineering a hypothetical completely stock result using that percentage difference applied to your current dyno results. i think that would be a legit comparison.

https://forum.ih8mud.com/100-series-cruisers/514381-dt-headers-dyno-result-thread.html

i am surprised at how much difference just a cat back makes. it will be interesting to see the further impact of mid-pipes and/or the new ems long headers.

my manifold ticks nicely and i have a cheap aftermarket muffler and short pipes that sound awful at certain rpms and loads so i look forward to you next installment (in both senses).

Same cruiser. Same Dyno. DT headers and each cat back system respectively.

Mid pipe test coming.

The DT header before after was done with stock tires. The cat back with 285. I will insert more details as time permits.

 

[Romer]

Pretty significant. Thanks Rob for doing the test and thanks to both vendors for providing the equipment. It's nice to have options

 

[Wilsil]

I am a novice with tuning a car.
Can someone explain to my what the effect is by changing to headers/extractors, what mid pipes are and cat back?

 

[100lurker]

RobRed. Since you have had both system. Can you offer us some insight on some of the following? I'm making my decision on which to get this week and it would be a great help to make an informed decision. I see that the EMS system blew away the DT for power gains. But I'd like to know more on the comparison before making my decision of which to purchase for my 100
- which one was easier to install
- any comments on build quality, material quality, hardware quality
- how did the sound compare?
- which one was louder, and which was quieter
- any other comments that would help us make a more informed decision?

 

[Duiser Offroad]

Nice results. Very happy you made this happen! Thanks!

 

[semlin]

SThe DT header before after was done with stock tires. The cat back with 285. I will insert more details as time permits.

i think if you measure the % difference in hp and torque between the two old dt header comparisons at a given rpm and then apply that % to the dt header stock result at the same rpm on the new test you can calculate an inferred completely stock result for the new test. it will not be completely reliable but given it's the same vehicle the % differences should be pretty consistent even though it's a different dyno and different tires.

where i am going with this is your result is baselined to a dt header equipped vehicle whereas many people reviewing this test will be looking to see the overall impact of attaching the entire system to a totally stock vehicle.

 

[RobRed]

it's hard to correlate the differences because the header may allow for additional gains in concert with the exhaust.

In example the exhaust may only add 7% to a truck with factory manifolds but add 10% on a truck with headers of some sort. I've overlaid the DT before and after on the exhausts curves and the power curve shape is very consistant between them. As time permits I will add some charts that show these things.

I think the overall take away is that either system adds performance and reduces weight.

Check post #1 for addition data bout the truck and dyno runs.

 

[RobRed]

RobRed. Since you have had both system. Can you offer us some insight on some of the following? I'm making my decision on which to get this week and it would be a great help to make an informed decision. I see that the EMS system blew away the DT for power gains. But I'd like to know more on the comparison before making my decision of which to purchase for my 100
- which one was easier to install
- any comments on build quality, material quality, hardware quality
- how did the sound compare?
- which one was louder, and which was quieter
- any other comments that would help us make a more informed decision?

I can. I will be adding additional details to post 1 in the coming days.

 

[1loudLX]

Can someone measure the tire clearance of the EMS exhaust and let me know what size tire you have hanging? If you were to think of the tire as a clock, laying down underneath the truck with your head towards the front I'm mainly concerned with the 10-11 clearance and less on the straight back part that runs parallel with the frame. Also, EMS already posted pics of that. Currently with the 35" tire underneath under certain loads/angles/flex my current exhaust gets extremely close to the tread and has actually melted it in on spot.

 

[semlin]

it's hard to correlate the differences because the header may allow for additional gains in concert with the exhaust.

In example the exhaust may only add 7% to a truck with factory manifolds but add 10% on a truck with headers of some sort. I've overlaid the DT before and after on the exhausts curves and the power curve shape is very consistant between them. As time permits I will add some charts that show these things.

I think the overall take away is that either system adds performance and reduces weight.

Check post #1 for addition data bout the truck and dyno runs.

thanks for the update in post 1. good stuff. i agree that you could not extrapolate a result with stock manifolds and a cat back exhaust. i do think you could estimate a virtual "base" truck under the new dyno series with an all stock exhaust on 285s that would show the approximate gains to be had by adding dt headers and either catback system. however, i can also do that myself by comparing the two threads so don't worry about it

whatever system it is, the overall gains seem to be pretty significant even with the stock cats in place. this surprises me.

 

[lesgarten]

Can someone measure the tire clearance of the EMS exhaust and let me know what size tire you have hanging? If you were to think of the tire as a clock, laying down underneath the truck with your head towards the front I'm mainly concerned with the 10-11 clearance and less on the straight back part that runs parallel with the frame. Also, EMS already posted pics of that. Currently with the 35" tire underneath under certain loads/angles/flex my current exhaust gets extremely close to the tread and has actually melted it in on spot.

Hi 1loudLX,
You might get a quicker more accurate answer in the EMS CAT Back thread.

 

[jgray]

Thanks Robred for the time and effort put into reviewing the different setups... I'm glad I've been holding out prior to ordering my exhaust upgrades... My 100 will be getting the full EMS treatment; almost pulled the plug last week on some of their stuff... Looking forward to the EMS header data as well; all their work appears to be top notch... Check out their Facebook page to see some of their other impressive projects...

 

[CanadianRockyCruiser]

I got the last two pieces of my EMS pipes today (clamps, oddly enough... didn't ship with the first batch). Can't wait to install it see if I can feel the gains after installing early next week

Thanks to RobRed for tesing!

 

[2000UZJ]

Apparently the DT Cat-Back spits fire out the back. It was awesome.

 

[kennyao30]

Apparently the DT Cat-Back spits fire out the back. It was awesome.

Yes very awesome. Couldn't believe I saw that!