Header and Exhaust Install (Doug Thorley Products)

[JBHorne]

My name is Nick and I am the sales manager at Thorley. First I have to thank DTT for the use of his LC. We had high hopes for a true dual split rear system but there is just not any clearance for the tubes on the passenger side. We have three designs we are working on. We are going to have a dual dr. side exit with TRD style tips. Then we will have a single 3" out the dr side. Lastly we will have the single 3" out the back like stock. The systems will be completely constructed of 2.5" and 3" stainless with stainless mufflers and tip. On the tundra we saw anywhere from 13-17hp just with a catback so the LC should be the same. Combine that with our long tube or shorty headers for a gain in excess of 40hp and 40tq. That is going to be a lethal combo. As far as pics I dropped the ball and can't find the cable to the camera. I will get pics as promised on Monday.

Thanks
Nick

So is this a true dual, or a Y-split? Could you not have a true duel even if the pipes are on the driver's side?

I asked these quesitons earlier. Can you comment or provide more info?

Thanks and I'm sure it be great!

Changing the headers can make a deeper sound if they flow more air, which they will -- that's the idea.
Coming off the headers you have:
1) Catalytic converter -- you aren't changing it
2) Muffler -- new free-flow muffler, correct?
3) Resonator -- removed.

In the pics you posted there is no resonator, btw.

Also, do you know where the duals connect? I doubt this is a true twin -- meaning that the left and right headers are kept separate and have separate mufflers all the way to dual tips. (which by the way would be freakn' awesome!)

Do you know the stock pipe diameter was and what the new one is? I'm assuming as well that this is all mandral bended, correct?


Sorry so many questions, but this is definitely my next mod!!!

 

[Bear80]

Sounds like a cool prototype. I'm curious about the power increase. Toyota went to a whole lot of trouble in the design of the oem muffler. There is a door system that opens up during high flow (full throttle) to allow a near free flow pattern. I personally would have kept the oem muffler after reading how it was made.

Isn't the stock manifolds close to a short header design? It would interesting to see how the power band moves around with a longer header set. I'd say even though you can't do a apples to apples dyno, it would be interesting to see how it changes.

 

[JBHorne]

Sounds like a cool prototype. I'm curious about the power increase. Toyota went to a whole lot of trouble in the design of the oem muffler. There is a door system that opens up during high flow (full throttle) to allow a near free flow pattern. I personally would have kept the oem muffler after reading how it was made.

Isn't the stock manifolds close to a short header design? It would interesting to see how the power band moves around with a longer header set. I'd say even though you can't do a apples to apples dyno, it would be interesting to see how it changes.

Can you provide information on this oem system? I knew Acura had a similar system on the RL a few years back, but I never knew Toyota had one.

But I gotta tell ya, when you give it a bit of gas past 3K RPMs, the exhuast note definitely opens up. Is this a bypass valve of some sort?

 

[Bear80]

JBHorne, I have no reference to that information. It was shared during the 200 series presentation at Toyota USA's 50th celebration.

 

[dtt255]

JBHorne, I have no reference to that information. It was shared during the 200 series presentation at Toyota USA's 50th celebration.

Well I guess that solves that then!

 

[dtt255]

Well here is an update!

I am picking her up tomorrow morning at about 8-9 am. I have an appt at 10:30 for a Dyno.

Now the experts have spoken (Slee) and I know that not having a starting Dyno is counter-productive, but here is what I am hoping....

That someone else will get off their lazy butt and get a Dyno done of their LC so we have some basic comparable stats. It will not be a perfect comparison but it will be a good range, at least I think so.

Now I could be a jerk and say that I won't post the dyno results, any pics or videos until someone else does a dyno so we can get some comparisons....but we all know that is NOT going to happen!

So I would appeal to anyone else to go find a dyno place and get theirs done so we can compare on a basic level.

Anyway, more then the power increases, or sound differences, I am very curious as to the MPG changes.

So anyway....would SOMEONE please go do a dyno on theirs!!

I now end this public service announcement!

 

[JBHorne]

Well here is an update!

I am picking her up tomorrow morning at about 8-9 am. I have an appt at 10:30 for a Dyno.

Now the experts have spoken (Slee) and I know that not having a starting Dyno is counter-productive, but here is what I am hoping....

That someone else will get off their lazy butt and get a Dyno done of their LC so we have some basic comparable stats. It will not be a perfect comparison but it will be a good range, at least I think so.

Now I could be a jerk and say that I won't post the dyno results, any pics or videos until someone else does a dyno so we can get some comparisons....but we all know that is NOT going to happen!

So I would appeal to anyone else to go find a dyno place and get theirs done so we can compare on a basic level.

Anyway, more then the power increases, or sound differences, I am very curious as to the MPG changes.

So anyway....would SOMEONE please go do a dyno on theirs!!

I now end this public service announcement!

The problem is that even different cars done on the same dyno on the same day with the same temperature, barometric pressure, altitude and all other variables constant will have varying dyno results. It's not uncommon to have a ±5-10hp difference. Now add in to the equation that I am 2000+ feet higher than you, have warmer weather with very low humidity, my combustion is quite different. Even the fact that I have different gas then you matters. We could easily have ±20hp difference even when our vehicles were stock.

Sorry, to break it to ya, but dyno results are not possible anymore. I'm surprised that thorley didn't insist on dynoing it first simply because that is a strong advertising point. Now until someone else bites and has the dyno first, we won't know the results other than you telling us your anecdotal results.

I think what I'm more interested in is what Bear80 brought up about the valve that opens at WOT. I wonder if Thorley can comment if they found this valve system and what they did with it...maybe nothing...maybe it's still there, but if there is a "bypass" of some sort, then you will see a spike on the dyno charts when it opens.

I also want to know about the infamous drone on the highway. Many companies are good at tuning the exhuast to not drone below 2.5K RPMs so when you are cruising on the highway it's not annoying, but put your foot down and hear that V8 rumble! Other companies absolutely suck at tuning away the drone.

Can't wait till you get it back!!!

EDIT: I still would like to see your dyno charts, because there is more to it than just peak HP/TQ. I'm sure you broke 400HP though and maybe 410-420 torque. I'd like to see what your low end results are however.

 

[dtt255]

The problem is that even different cars done on the same dyno on the same day with the same temperature, barometric pressure, altitude and all other variables constant will have varying dyno results. It's not uncommon to have a ±5-10hp difference. Now add in to the equation that I am 2000+ feet higher than you, have warmer weather with very low humidity, my combustion is quite different. Even the fact that I have different gas then you matters. We could easily have ±20hp difference even when our vehicles were stock.

Sorry, to break it to ya, but dyno results are not possible anymore. I'm surprised that thorley didn't insist on dynoing it first simply because that is a strong advertising point. Now until someone else bites and has the dyno first, we won't know the results other than you telling us your anecdotal results.

I think what I'm more interested in is what Bear80 brought up about the valve that opens at WOT. I wonder if Thorley can comment if they found this valve system and what they did with it...maybe nothing...maybe it's still there, but if there is a "bypass" of some sort, then you will see a spike on the dyno charts when it opens.

I also want to know about the infamous drone on the highway. Many companies are good at tuning the exhuast to not drone below 2.5K RPMs so when you are cruising on the highway it's not annoying, but put your foot down and hear that V8 rumble! Other companies absolutely suck at tuning away the drone.

Can't wait till you get it back!!!

EDIT: I still would like to see your dyno charts, because there is more to it than just peak HP/TQ. I'm sure you broke 400HP though and maybe 410-420 torque. I'd like to see what your low end results are however.

I agree on the good and bad of the Dyno at this point. I will get it done to see what you mentioned above.

It only costs about $80-90 and an hour or so of time.

 

[dtt255]

Well 2 1/2 hours and counting!!!!!

 

[Bomar]

no updates?????

 

[dtt255]

no updates?????

I knew someone would phreaking ask!!

Ok I drove down there ( an hour and a half) and everything looked and sounded great.

I went to leave and guess what....the steering wheel would not turn. I asked if they touched the steering system at all and they didn't.

Well we ran into a small rare issue. It seems that one of the screws on the steering column was long enough to get caught on the headers, not letting the column turn.

Kind of a major issue. When ever they took her off the lift, it was to check clearance on the exhaust, and only moved her back and forth off of the lift.....never needing to turn the wheels!

Anyway they are pulling off the drivers side header and changing the shape of one of the pipes from round to oval which will fix the issue. It won't change the output at all.

The exhaust looked awesome but I told them that it is hanging too low for off roading. (I will enclose pics when I get home). It looks great, but will get demolished when off the road.

So we put her on the lift and discussed getting rid of the nice looking tailpipes (which don't do anything but look nice) and making the exhaust terminate under the bumper ( more like stock) without any fancy tip. This would make the bumper bottom the lowest point in the rear, not the exhaust.

They agreed and are doing that mod also.

She will be ready on Monday.

I have to say that the work is top notch and looks great.

Nick explained that in the middle east (where most of their sales go for LC's) that they like the bling bling of the exhaust and also are dealing with sand, not rocks, so that having it lower in the rear is not so much of an issue.

Oh well, should be even better then expected on monday!

Now on the good side I do have pics of the exhaust piping and headers that I will post tonight when I get home.

I guess this is what happens when you are the guinea pig!

 

[dtt255]

Well no comments?! Everyone must be more upset then me!

 

[El_THEEB]

That sucks!! The guys at DT have very good products and even better deals!! so i trust that your rig will be taken care of!! Cant wait to hear the sound of the 5.7 !!!

 

[dtt255]

Here is what the dual straight rear looks like. Look at the nice thick piping! BTW In the box it is leaning on are the OEM headers!

Here is the Dual Drivers side, nice looking, but not 'offroad' practical:

The nice thick dual pipes heading to the tips (pic from rear)

Pipes coming off the stock 1st muffler: (see them going over the rear axel)

The headers (obviously hard to get pics)

Like I said...they make great looking and high quality stuff!!

 

[uaecent]

dtt <===== you the MAN
it looks so nice . good luck

 

[Bomar]

they do some nice work.

 

[bwbski26]

I told you not to go with the dual driver side exhaust. its there to be crunched when you come off an obstical. but you were more concerned with backing into something and dent you tip. lol. too funny now once you see it, you see the light, and realize that it is in the worst spot possible. glad you at least saw the light while you where there, rather then in your garage, backing up and hitting your garage again. lol.

 

[dtt255]

I told you not to go with the dual driver side exhaust. its there to be crunched when you come off an obstical. but you were more concerned with backing into something and dent you tip. lol. too funny now once you see it, you see the light, and realize that it is in the worst spot possible. glad you at least saw the light while you where there, rather then in your garage, backing up and hitting your garage again. lol.

Ok wiseass....I think it is REALLY funny how you assume I chose that....I didn't. I chose the dual drivers rear, by MISTAKE they put on the drivers side exit. I was going to go back to them in about a month and do the tucked up exhaust with no tips showing. So that is what is happening.

So on both accounts you were wrong.

If you want to bring up something that happened to me months ago, go ahead. Instead of talking out of your ass why don't you pony up money and get a 200 series, otherwise you have no room to talk.

 

[chimyz]

Nice looking headers...of what you can see. I'm seriously looking at going that route, but I'll need to save up my pennies from the paper route, may be a couple of months, once your's have broken in, and all's good!

The diameter on the exhaust will certainly help a bit...nice big size. When you are talking to them again, please ask about the black paint option we talked about, and also why so much welding coming off the 3-1/2" tube to split? Are the bends that severe that they can't use a bender? Just wondering. I don't know the first thing about bending (except how to crimp a pc of pipe), so there may be some issue with getting it fit into a mandrel bender.

 

[chimyz]

Love the trailing arm pic!

Show off.