Alpine Exhaust

I don’t know if it’s been done, but it would be cool to see a stock truck dynoed, then dunked with Keith’s exhaust, and finally dynoed on this new exhaust. Same dyno, same day.

 

What??? And use real logic? How we gonna argue if we have actual data?

 

Problem is, did that in 2013. Now I can predict what will happen. There will be zero difference on the Dyno. Since your full throttle and since the stock muffler is removed both systems will gain 3-10hp and 10-20tq to the rear wheels over stock.

which is great. But with the super long 5th and 6th gears, when you lose low end torque by using a dual exhaust you use 6th gear way less during regular driving. It’s back n forth between 5th and 6th.

it’s comical to see guys claim ‘mine doesn’t do that’ when they have a dual exhaust and stock exhaust manifolds. They’re the exception? Their truck was built on the production line differently? LOL. And the lol wasn’t condescending, it was actually funny. Haha!!

You can lead a horse to water…

 

I’d think that dyno chart comparisons would offer realistic info across the entire rpm range. Just like when we tune our trucks. The max gains may not be drastic, but the overall is a phenomenal difference.

You’re probably right though, as lots of folks will only see the max yield and won’t look at the graph to see how much is gained (or lost) in the rpm range we typically use.

I think it would be great to see what a Dirty Deeds and the new SPD dyno charts look like on the same truck since they’re taking two totally different approaches for performance gains. A naturally aspirated test mule would cover the majority of the market.


And I haven’t tried any of the exhausts. Fella at work has a DD system and loves it. I like my quiet truck, but wouldn’t be opposed to a good bump in power if the noise was reasonable. In all honesty, I’d be that guy with the 12” mufflers…

 

Sound like we have a volunteer test mule…

 

If we can come up with a way to get two exhaust systems sent to a local shop with a dyno, get the dyno time donated in the name of science, as well as set forth some parameters that are mutually agreed upon for analysis, I’ll post the exact results and buy an exhaust.


I’m close enough to SPD to go their direction if they can arrange a dyno and DD will send a system for testing. The resonator will not be installed for testing. It will be installed if that’s the system that is left on the truck.

 

@dirtydeeds Hey Keith. Hypothetically if I were to replace my TRD duals with one of your TRD replacement system with an X pipe, would I still make less low end torque than if I went with one of your single exit systems? This is on a supercharged application.

 

Yes. And yes. Our TRD rep system will gain low end torque over what you have. But our single exhaust will make even more low end torque over what you currently have.

Being supercharged, at full throttle, they ALL make the same power.

 

I have the 26" DD system..lol. Seriously though, I do!

 

All good info, thanks. My biggest problem is I don’t want to give up the dual side exits as I like hearing the sound on both sides of the truck no matter which windows I open. That makes it hard to go with the single exit, or similarly a dumped system for me personally. Guess I’ll just have to leave some 6th gear cruising torque on the table! Luckily I’m not exactly feeling the lack of it most of the time, especially since tuning torque converter lockup and shift points via HPT should aid this.

 

I preface this by saying that nearly every tundra exuast post mentions Kieth at DD. So i respect the mans opinion and expertise. Every vehicle i have ever owned i had aftermarket exhaust, not for performance but simply becuase of the sound. And with sound being objective to everyones own opinion i really like the Carven R and Corsa Sport. So here are my questions/thoughts regarding a couple of options i am considering. I am going with Carven R becuase of the sound/cost. I like the look of duals exiting the rear with 3" maybe 4" tip. If i go duals do i need 2.5" or 3" muffler to minimize tq loss? Also assuming i would add X pipe. And how much low end tq are we talking? 3-5 pts or 30 pts? Also, i am frugale (cheap). The most likely option is simply replacing my factiroy exhaust with a single $100 Carven R and $100 shop install. Would you recommend the 2.5" or 3" Carven? I am an over researcher to the point where i start going down crazy rabit holes. Honestly, aftermarket exhaust for me is purely a sound benefit... But now you got me worried about low end tq loss. Is it noticable? I don't pull anything more than aboiut 4k lb and thats rarely. if i cut out the submarine and weld in a 2.5" or 3" Carven R... leave all other factory pipe alone, same side exit... what should i expect? still increase in overal HP/TQ but a drop in low end grunt... But how much low end grunt and would the 2.5 or 3 make a difference? That's a lot of questions... but oddly nobody seems to have asked what i asked or at least i am not finding the discussion on the web.
thanks in advance for the feedback from the forum and hopefully @dirtydeeds
PS.... will it give me an extra 6-10 mpg increase ? I kid I kid...

Thanks Jim